Lawyers Archive

David B. Tye is an associate in the Washington, D.C., office of Gibson Dunn. He practices in the firm’s Litigation Department.

Before joining Gibson Dunn, David clerked for Judge Andrew L. Brasher on the United States Court of Appeals for the Eleventh Circuit, and Judge Matthew J. Kacsmaryk on the United States District Court for the Northern District of Texas.

David received his law degree from Harvard Law School, cum laude, where he was a Senior Editor on the Harvard Journal of Law & Public Policy. He received his undergraduate degree from North Carolina State University, summa cum laude with valedictorian honors.

David is admitted to practice law in the District of Columbia.

Steve Pet is an associate in the Washington, D.C. office of Gibson Dunn and a member of the firm’s Antitrust and Competition Practice Group.

He advises clients on all aspects of antitrust law, with a focus on merger and conduct investigations before the Federal Trade Commission, the Department of Justice, and state attorneys general. Steve also represents clients in complex private and government antitrust litigation, and has significant experience litigating and counseling on Robinson-Patman Act matters. His experience spans a broad range of industries, including healthcare, pharmaceuticals, consumer products, energy, satellite communications, and technology. Steve is recognized in Best Lawyers: Ones to Watch® in America for Litigation – Antitrust.

An active leader in the antitrust bar, Steve serves as Vice Chair of the ABA Antitrust Section’s Mergers and Acquisitions Committee and has previously served as Vice Chair of the Agriculture and Food Committee and the U.S. Comments & Policy Committee. Before law school, he spent three years as an Honors Paralegal in the FTC’s Bureau of Competition, working at both the staff level and in the Bureau Director’s Office on major enforcement matters, including the FTC’s successful challenge to the proposed $3.5 billion Sysco–U.S. Foods merger.

Steve received his law degree from the University of Virginia School of Law, where he graduated Order of the Coif and served on the Virginia Law Review. Steve earned a Bachelor of Arts degree summa cum laude from Hamilton College.

Representative matters include*

Merger Reviews and Government Antitrust Investigations

Represented Amazon in securing the FTC’s unconditional clearance of Amazon’s acquisition of One Medical
Represented Pioneer Natural Resources in securing the FTC’s clearance of ExxonMobil’s $64.5 billion acquisition of Pioneer, which created the largest oil and gas producer in the Permian Basin
Represented SES in securing unconditional clearance from DOJ and numerous other competition authorities of SES’s acquisition of Intelsat, a global satellite competitor
Represented Celgene in securing the FTC’s conditional approval of its $74 billion acquisition by Bristol-Myers Squibb
Represented Arch Resources in securing unconditional approval of its $5 billion dollar merger with Consol Energy to form Core Natural Resources
Represented DaVita in securing the FTC’s conditional approval of its acquisition of the University of Utah’s dialysis business
Represented Merck in securing global antitrust clearance for its acquisition of Prometheus Biosciences
Represented General Electric in its acquisition of BK Medical
Represented Zensho Holdings in its acquisition of Snowfox Group
Represented large technology company in FTC 6(b) study on non-reportable acquisitions, and global food producer in FTC 6(b) study on supply chain disruptions

Antitrust Litigation

Represented PepsiCo in Robinson-Patman litigation brought by the FTC; the FTC voluntarily dismissed the case without conditions (S.D.N.Y.)
Representing Frito-Lay in putative class action alleging Robinson-Patman and state law claims (C.D. Cal.)
Representing Boehringer Ingelheim in antitrust class actions involving alleged monopolization based on FDA Orange-Book listings (D. Mass.)
Represented Arch Coal in its proposed joint venture with Peabody Energy, from initial investigation through Section Request and litigation against the FTC (E.D. Mo.)
Represented a generic pharmaceutical manufacturer in massive multi-district antitrust litigation brought by state attorneys general and putative private plaintiff classes (E.D. Pa.)

*Includes matters handled prior to joining Gibson Dunn

Steve is admitted to practice in the District of Columbia.

Alexander C. Meade is an associate in the Washington, D.C. office of Gibson Dunn. He practices in the firm’s Litigation Department.

Before joining Gibson Dunn, Alexander served as a Law Clerk to the Honorable Andrew L. Brasher of the U.S. Court of Appeals for the Eleventh Circuit and the Honorable Allison H. Eid of the U.S. Court of Appeals for the Tenth Circuit.

He received his law degree with Honors in 2022 from the University of Chicago Law School, where he served as an Online Editor of The University of Chicago Law Review and as the Managing Student Director of the Kirkland & Ellis Corporate Lab Clinic. In law school, Alexander also earned the Kirkland & Ellis Corporate Lab Award of Excellence and Pro Bono Honors. Before law school, he spent three years as a Paralegal at the U.S. Department of Justice Criminal Division’s Fraud Section, where he worked on securities and financial fraud investigations. He received his undergraduate degree cum laude with distinction in Philosophy, Politics, and Economics from the University of Pennsylvania in 2016.

Alexander is a member of the bars of the District of Columbia and Texas, and he is admitted to practice before the U.S. Courts of Appeals for the Tenth and Eleventh Circuits.

Samuel Eckman is a partner in the Los Angeles office of Gibson Dunn. He is a member of the firm’s Appellate and Constitutional Law and Class Actions Practice Groups.

Samuel has been recognized in Best Lawyers: Ones to Watch® in America for Appellate Practice (2022-2024), and by Benchmark Litigation as a “Future Star” (2025).

Samuel’s recent representations include:

Obtaining a unanimous victory from the United States Supreme Court in an action seeking over $20 billion in damages. Comcast Corp. v. National Association of African American-Owned Media, 589 U.S. 327 (2020).
Winning a landmark ruling in the United States Supreme Court upholding the City of Grants Pass, Oregon’s public-camping laws in a case of widespread importance for local governments across the country grappling with the homelessness crisis. City of Grants Pass, Oregon v. Johnson, 144 S.Ct. 2202 (2024).
Persuading the California Supreme Court to unanimously reverse a Court of Appeal decision limiting the authority of trial courts to impose monetary sanctions for discovery misconduct. City of Los Angeles v. PricewaterhouseCoopers, LLP, 17 Cal.5th 46 (2024).
Slashing a $350 million punitive damages award by 95% on post-trial motions in the Central District of California, and winning complete vacatur on appeal to the Ninth Circuit. Bahamas Surgery Center, LLC v. Kimberly-Clark Corp., 2018 WL 11274489 (C.D. Cal. 2018); Bahamas Surgery Center, LLC v. Kimberly-Clark Corp., 820 F. App’x 563 (9th Cir. 2020).
Reducing a $30 million punitive damages award by 67% to $10 million on post-trial motions in a wrongful-termination case in the Los Angeles Superior Court.
Securing precedent-setting decisions in the Third and Ninth Circuits holding that rideshare drivers are not exempt from arbitration under the Federal Arbitration Act’s transportation-worker exemption. Capriole v. Uber Techs., Inc., 7 F.4th 854 (9th Cir. 2021); Singh v. Uber Techs., Inc., 67 F.4th 550 (2023).

Before joining the firm, he served as a law clerk to the Honorable Antonin Scalia, Associate Justice of the U.S. Supreme Court, and the Honorable Alex Kozinski, then-Chief Judge of the U.S. Court of Appeals for the Ninth Circuit.

Samuel graduated with high honors from The University of Chicago Law School in 2013. While there, he served as editor-in-chief of The University of Chicago Law Review, and was selected as a Kirkland & Ellis Scholar and as a member of the Order of the Coif. He also was awarded a John M. Olin Student Fellowship in Law and Economics, and a Bradley Family Foundation Fellowship.

Miguel is a partner in the Washington, D.C. office of Gibson Dunn and Co-Chair of the firm’s Judgment and Arbitral Award Enforcement Practice Group. Miguel has represented clients before federal and state courts throughout the country in a broad range of matters. He has argued 24 cases before the United States Supreme Court and briefed many others. He has also argued dozens of appeals in the lower federal and state courts.

Best Lawyers® recognized Miguel as a 2024 “Lawyer of the Year” in the categories of Appellate Practice and Intellectual Property Litigation. Miguel was recognized by Benchmark Litigation as a 2020 U.S. Appellate Litigation “Star.” In 2014, The American Lawyer named him a “Litigator of the Year,” praising his “brains and tenacity” and noting he is the lawyer to call for “a tough, potentially unwinnable case.” Since 2014, Chambers has consistently named him as one of a handful of attorneys that ranked in the top tier among the nation’s leading appellate lawyers. Chambers noted that “clients are impressed by his intellect and ability,” with clients saying, “He’s got a quick, sharp intellect and is a very effective advocate,” and “He’s razor-sharp in his thinking and has a real flair in his writing.” The Atlantic described his oral argument in a 2014 high-profile separation-of-powers case as “one of the most dazzling arguments the marble chamber has heard in many years.”

Miguel has been named among Lawdragon’s 2026 “500 Leading Litigators in America” and acknowledged as one of Lawdragon’s “500 Leading Lawyers in America” for multiple years. In 2024, Miguel was ranked by Legal 500 US for his work in Dispute Resolution, recognized by Who’s Who Legal 2023 in the category of Commercial Litigation, and featured in the Washingtonian Magazine as one of “Washington’s top legal talent” in the Supreme Court category. Miguel was selected by his peers for inclusion in the 2022 edition of The Best Lawyers in America® in the area of Appellate Law, in addition to previous recognition by the publication in the specialties of Bet-the-Company Litigation, Commercial Litigation, Criminal Defense: White Collar, Intellectual Property Litigation, and Regulatory Enforcement Litigation in the areas of SEC, Telecom, and Energy. In 2017, he was elected as a member of the American Law Institute.

Representative Supreme Court matters include:

In Comcast Corp. v. Nat. Assn. African American-Owned Media (2020), he persuaded the Court to hold that 42 U.S.C. 1981 requires plaintiffs to prove but-for causation, and to reject a “motivating factor” test borrowed from Title VII of the Civil Rights Act of 1964
In Coventry Health v. Nevils (2017), he persuaded the Court to hold that insurance contracts entered by the Office of Personnel Management pursuant to the Federal Health Benefits Act of 1959 may validly preempt state and local anti-subrogation and anti-reimbursement laws.
In National Labor Relations Board v. Noel Canning (2014), he represented the Republican caucus of the United States Senate in successfully urging the invalidation of the President’s recess appointments to the National Labor Relation Board.
In Comcast Corp. v. Behrend (2013), he persuaded the Court to grant review of, and then reverse by a 5-4 vote, a certified antitrust class seeking $2.6 billion in damages.
In Black v. United States (2010), he represented media magnate Conrad M. Black in securing Court review and reversal of multiple convictions under the “honest services” provisions of the federal mail and wire fraud statutes. Based on his arguments, the Supreme Court significantly narrowed the scope of conduct that can be prosecuted as “honest services” fraud.
In Laboratory Corporation of America Holdings v. Metabolite Laboratories, Inc. (2006), he persuaded the Court to leave undisturbed a Federal Circuit ruling upholding the validity of a two-step process patent setting forth a method for diagnosing vitamin deficiencies.
In Northern Insurance Co. of New York v. Chatham County (2006), he persuaded the Court to rule unanimously that counties are not entitled to invoke sovereign immunity in admiralty actions.
In Aetna v. Davila Health (2004), he persuaded the Court to rule unanimously that federal law preempts state laws that give patients the right to sue managed care organizations.
In Strickler v. Greene (1999), he argued on behalf of a death row inmate pro bono in a challenge to his conviction and sentence.

In 2011, the Supreme Court appointed Miguel to brief and argue two criminal cases—Dorsey v. United States and Hill v. United States—in which the Solicitor General declined to defend the judgments of the court of appeals. Miguel was also part of the team that successfully presented then-Governor Bush’s position to the Supreme Court in Bush v. Gore (2000). Other cases that Miguel handled in the Supreme Court include Granholm v. Heald (2005) (dormant Commerce Clause and Twenty-First Amendment), Vermont Agency of Natural Resources v. United States ex rel. Stevens (2000) (False Claims Act, Article III standing and Eleventh Amendment immunity), Old Chief v. United States (1997) (rules of evidence), United States v. Mezzanatto (1995) (evidence and plea bargaining), United States v. Robertson (1995) (constitutional limits on Congress’s Commerce Clause powers), Citizens Bank of Maryland v. Strumpf (1995) (bankruptcy law), and NOW, Inc. v. Scheidler (1994) (RICO).

Recent Court of Appeals matters include:

Since 2017, Miguel has represented Crystallex International in district court and appellate proceedings to enforce Crystallex’s $1.4-billion arbitral award against Venezuela; in those proceedings, Miguel successfully persuaded the district court to issue (and the Third Circuit to affirm) that Venezuela’s national oil company, Petroleos de Venezuela, S.A. (PDVSA), is the alter ego of the Republic of Venezuela, thus permitting Crystallex to attach PDVSA’s U.S. assets – and in particular the shares of the Delaware parent of CITGO Petroleum–to satisfy Venezuela’s debt to Crystallex. Reporting on the 2019 four-hour oral argument in Venezuela’s first of many attempted appeals, The Financial Times noted that among the lawyers for “Venezuela, PDVSA and a motley of creditors”, Miguel “was the best litigator in the room.” A judicial auction of those assets is expected in the summer of 2024.
In Standing Rock Sioux Tribe v. U.S. Army Corps of Engineers, Miguel represented the owners of the Dakota Access Pipeline in challenges to the construction and, later, to the operation of the pipeline that were brought under various federal statutes by the Standing Rock Sioux Tribe and others; in 2021, he ultimately persuaded the D.C. Circuit to reverse an injunction that had ordered the pipeline shut down over purported violations of the National Environmental Policy Act.
In Wit v. United Behavioral Health (2022), Miguel persuaded the Ninth Circuit to reverse class actions judgments entered after trial under the Employee Retirement Income Security Act of 1974.
In Owner-Operated Independent Drivers Assn. v. Holcomb (2021), Miguel persuaded the district court and the Seventh Circuit to dismiss with prejudice a complaint challenging increased tolls on state-owned roads as discriminatory under the Constitution’s Commerce Clause.
In Atchafalaya Basinkeeper v. U.S. Army Corps of Engineers (2018), Miguel persuaded the Fifth Circuit to grant an emergency stay of, and then reverse, an injunction under the Clean Water Act and the National Environmental Policy Act preventing construction of the Bayou Bridge Pipeline through southern Louisiana.
In Total Gas & Power North America v. FERC (2017), Miguel represented a major energy producer in statutory and constitutional challenges to the authority of administrative agencies to withdraw from Article III courts the adjudication of claims for money penalties.
In Coquina Invs. V. TD Bank, N.A., 760 F.3d 1300 (11th Cir. 2014), persuaded the court to uphold a jury verdict and sanctions in fraud case arising out of a Ponzi scheme.
In FERC v. JPMorgan Ventures Energy Corp. (D.C. Cir. 2013), argued two appeals on discovery issues arising out of FERC’s investigation of alleged market manipulation; the investigation was closed by settlement before decisions were issued.
In Espenscheid v. DirectSat USA, LLC, 705 F.3d 770 (2013), persuaded the court to reject class certification and collective-action treatment for overtime claims.
In Comcast Cable Communications, LLC v. FCC, 717 F.3d 982 (D.C. Cir. 2013), persuaded the court to reverse an FCC decision in a program-carriage case.
In Georgia Pacific Consumer Prods. v. von Drehle, 710 F.3d 527 (4th Cir. 2013), persuaded the court to reverse a judgement notwithstanding verdict in a trademark infringement case.
In Fox v. FCC, 613 F.3d 317 (2d Cir. 2010), persuaded the court to invalidate the FCC’s indecency policy under vagueness doctrine.

Other matters:

Since 2008, Miguel represented Philip Morris and its parent Altria in complex litigation in federal and state courts, including the defense and appeal of the U.S. government’s long-running RICO case against the tobacco industry, tort cases brought in Florida state and federal courts under Engle v. Liggett Group (2006), and affirmative litigation against federal and state governments on preemption, first amendment and administrative-law grounds.
In 2014, Miguel represented a large financial institution in a tax dispute with the Commonwealth of Puerto Rico and was part of a team that prevailed in a bench trial.
In 2013, Miguel represented the CEO of PokerStars, the largest online poker cardroom in the world, in settling civil-forfeiture claims by the U.S. Attorney for the Southern District of New York.
From 2004 to 2009, Miguel defended Cessna in federal court litigation arising out of the largest airline disaster in Italian history, ultimately securing dismissal of most of the claims.
From 1999 to 2005, Miguel was a lead attorney for Aetna in dozens of class actions against the managed care industry that the Judicial Panel for Multidistrict Litigation consolidated in the United States District Court for the Southern District of Florida (MDL No. 1334).
In addition, Miguel has extensive experience litigating against administrative agencies, including the Federal Communications Commission, the Federal Energy Regulatory Commission, and the Food and Drug Administration.

Miguel joined Gibson Dunn in 1997, after serving for five years as Assistant to the Solicitor General of the United States. He previously served as Assistant U.S. Attorney and Deputy Chief of the Appellate Section, U.S. Attorney’s Office, Southern District of New York. In those capacities, Miguel represented the government in numerous jury trials and in many appeals before the U.S. Court of Appeals for the Second Circuit.

Miguel is a Trustee of the Supreme Court Historical Society. He was formerly a member of the Board of Visitors of Harvard Law School.

Miguel served as a law clerk to the Honorable Anthony M. Kennedy in the U.S. Supreme Court from 1988 to 1989 and to the Honorable Amalya L. Kearse in the U.S. Court of Appeals for the Second Circuit from 1986 to 1987. He received a J.D. degree magna cum laude in 1986 from Harvard Law School, where he was editor of the Harvard Law Review. Miguel graduated with an A.B. degree magna cum laude and Phi Beta Kappa in 1983 from Columbia College, New York. He is fluent in Spanish and proficient in French.

Andrew Ebrahem is an associate in the Washington, D.C. office of Gibson Dunn. He practices in the firm’s Litigation Department, and is a member of the firm’s Appellate and Constitutional Law, Labor and Employment, and Administrative Law and Regulatory Practice Groups.

Before joining the firm, Andrew served as a law clerk for the Honorable Judge Allison J. Rushing of the U.S. Court of Appeals for the Fourth Circuit and for the Honorable Judge John B. Nalbandian of the U.S. Court of Appeals for the Sixth Circuit.

Andrew graduated from the University of Virginia School of Law, where he was elected to the Order of the Coif. While in law school, Andrew was an Articles Editor of the Virginia Law Review, served as a Legal Writing Fellow, and externed for the Honorable Judge Rossie D. Alston Jr. of the U.S. District Court for the Eastern District of Virginia. Andrew received a Bachelor of Arts with high distinction in Philosophy from the University of Virginia, where he was awarded most outstanding thesis of the year. While in college, Andrew interned at the Federal Trade Commission, Office of the General Counsel.

Andrew is admitted to practice law in the Commonwealth of Virginia and the District of Columbia.

Natalie Dygert is an associate in the Orange County office of Gibson Dunn. She is a member of the firm’s Litigation Department, and practices in the firm’s Class Actions, Antitrust & Competition, and Labor & Employment Practice Groups. She represents clients in a wide range of high-stakes complex commercial cases, with an emphasis on pharmaceutical antitrust and competition, intellectual property, and employment matters.

Natalie recently rejoined the firm after serving as a law clerk to the Honorable Percy Anderson of the United States District Court for the Central District of California. She graduated from UCLA, where she was a member of the Moot Court Honors Board. Natalie holds a bachelor of Arts degree in Psychology and Criminology from the University of California, Irvine.

Thomas H. Dupree Jr. is Co-Partner in Charge of the Washington, D.C. office of Gibson Dunn, Co-Chair of the firm’s nationwide Appellate and Constitutional Law Practice Group, and a member of the firm’s litigation department.

Tom is an experienced trial and appellate advocate. He has argued more than 100 appeals in the federal courts, including in all 13 circuits as well as the United States Supreme Court. He has represented clients throughout the country in a wide variety of trial and appellate matters, including cases involving punitive damages, class actions, product liability, arbitration, intellectual property, employment, and constitutional challenges to federal and state statutes. Chambers and Partners has named Tom one of the leading appellate lawyers in the United States every year since 2012, and The Legal 500 has similarly recognized Tom for years as one of the nation’s “leading lawyers.”

Tom previously served in the United States Department of Justice. He was appointed Deputy Assistant Attorney General for the Civil Division, and later became the Principal Deputy Assistant Attorney General. In that capacity, he served as the division’s second-in-command, overseeing the more than 900 lawyers in the Civil Appellate, Commercial, Federal Programs and Torts branches, as well as the Office of Immigration Litigation and the Office of Consumer Litigation. Tom was responsible for managing many of the government’s most significant cases involving regulatory, commercial, constitutional and national security matters on behalf of virtually all of the federal agencies, the White House, and senior federal officials. Before being named the division’s top deputy, Tom ran its largest litigating branch, managing a staff of 280 lawyers.

Legal Times has called Tom “no stranger to high-profile work.” Among other things, he played a substantial role in the successful representation of George W. Bush before the United States Supreme Court in Bush v. Gore, and represented New England Patriots quarterback Tom Brady in challenging his “Deflategate” suspension.

Tom argued and won, by a unanimous 9-0 vote, a landmark personal jurisdiction case in the United States Supreme Court, Daimler AG v. Bauman. For this achievement, American Lawyer magazine named him Litigator of the Week, noting that he “won over both the liberal and conservative wings of the court.”

In 2021, American Lawyer again named Tom its Litigator of the Week. This time he was recognized for winning a high-profile appeal in the midst of the chaos enveloping the U.S. Capitol on January 6.

Other matters Tom has handled include:

Persuading the Supreme Court to grant a petition for certiorari on behalf of a major automobile manufacturer and to vacate a $290 million punitive damage award, which had been the largest personal injury award ever affirmed on appeal in United States history.
Winning an appeal on behalf of Jerry and Jessica Seinfeld in the United States Court of Appeals for the Second Circuit in a copyright and trademark case involving the New York Times #1 bestselling book Deceptively Delicious.
Winning multiple cases for Churchill Downs concerning the eligibility of horses to race in the Kentucky Derby.
Winning an appeal for singer-songwriter Bob Dylan in a multimillion-dollar breach of contract case.
Successfully representing Facebook CEO Mark Zuckerberg in a federal lawsuit arising from the plaintiff’s fraudulent claim of a significant ownership stake in Facebook.
Successfully representing superagent Scott Boras in confidential baseball-related arbitrations.

Tom appears frequently on national television as a legal analyst. He is a regular guest on Fox News Channel and CNN. He has also appeared on CBS Evening News, NBC Nightly News, PBS NewsHour, ABC World News Tonight, and Good Morning America, as well as on MS NOW, CNBC, Bloomberg, Court TV, and C-Span. He has been quoted in numerous print publications, including the New York Times, Wall Street Journal, Washington Post, and others, discussing legal issues and developments. In addition, Tom has testified before Congress on constitutional and separation-of-powers issues, including the President’s authority to act through executive order.

Tom graduated cum laude from Williams College, and with Honors from the University of Chicago Law School, where he served as an Editor of the University of Chicago Law Review. After law school, he clerked for the Honorable Jerry E. Smith of the United States Court of Appeals for the Fifth Circuit.

Tom Donovan is an associate in the Los Angeles office of Gibson Dunn. He currently practices in the firm’s Litigation Department.

Before joining the firm, Tom served as a law clerk to the honorable Harris L. Hartz of the U.S. Court of Appeals for the Tenth Circuit.

Tom earned his J.D. from the University of Southern California Gould School of Law, where he was elected to the Order of the Coif and served on the Southern California Law Review. While in law school, Tom served as a judicial extern to the honorable Sandra S. Ikuta of the U.S. Court of Appeals for the Ninth Circuit. He graduated with a Bachelor of Business Administration from the University of Michigan Stephen M. Ross School of Business.

Tom is admitted to practice law in the State of California as well as before the United States Courts of Appeals for the Ninth and Tenth Circuits.

Austin M. Donohue is an associate in the Washington, D.C. office of Gibson Dunn.

In 2021 she received her juris doctor, magna cum laude and Order of the Coif, from Georgetown University Law Center. While at Georgetown, Donohue served as a Staff Editor for the Georgetown Journal of Gender and the Law, a Law Fellow for Georgetown’s first year Legal Research and Writing Program, and as a Research Assistant. she was also a member of Georgetown’s Appellate Courts Immersion Clinic, and served as an intern in the U.S. Department of Justice Civil Fraud Division.

Austin earned her undergraduate degree, summa cum laude, from the George Washington University in 2014. Prior to attending law school, from 2014-2018, she worked in the General Counsel’s office of the Biotechnology Innovation Organization.

She is admitted to practice in the District of Columbia.

Nat Deacon is an associate in the Washington, D.C. office of Gibson Dunn. He practices in the firm’s Litigation Department.

Nat graduated magna cum laude from the Georgetown University Law Center, where he served as an Articles Editor of the Georgetown Law Journal and as Law Fellow for the first-year Legal Research & Writing class. Nat was also a Student Attorney in Georgetown’s Appellate Courts Immersion Clinic, where he helped brief cases before the Fourth Circuit, Eleventh Circuit, and DC Court of Appeals.

Nat received his undergraduate degree from Bowdoin College, where he was a member of the school’s football team. Before attending law school, he worked as a data analyst at a consultancy.

He is admitted to practice law in the District of Columbia.

Carlo Felizardo is of counsel in the Washington, DC office of Gibson, Dunn & Crutcher. He is a member of the firm’s FDA and Health Care practice.

Carlo has extensive experience advising companies involved in the development, manufacturing, marketing, and distribution of U.S. Food and Drug Administration (FDA)-regulated products. He assists clients in interpreting, implementing, and ensuring compliance with FDA requirements across a wide array of product classes, including drugs, medical devices, and biological products.

Carlo also works with various entities involved in life sciences transactions to understand and mitigate potential regulatory risks. He has extensive experience in conducting FDA regulatory due diligence and drafting key disclosure and transactional language.

Carlo earned his law degree, cum laude, in 2016 from Northwestern University. He received his bachelor’s degree with high honors in political science and sociology and anthropology from Swarthmore College in 2011, and his master’s degree in sociology from Northwestern University in 2013.

Carlo is admitted to practice in Illinois and the District of Columbia.

Prior to joining Gibson Dunn, Carlo was an associate in the FDA practice at another global firm.

Shereen Zaki is an associate in the London office of Gibson Dunn and a member of the Antitrust and Competition and Litigation Practice Groups. She is currently on secondment.

She has experience of complex, high-value competition and commercial litigation. A recent highlight from her previous firm has been assisting with an appeal in the Supreme Court in relation to interchange fees.

Shereen has gained experience in many areas of commercial litigation, including complex financial claims, civil fraud claims, misrepresentation claims, breach of warrant of authority claims, rectification, and general contractual disputes.

In particular, she has experience of EU competition follow-on claims brought against addressees of European Commission infringement decisions, and in particular, large group actions.

Shereen has gained exposure to complex international disputes across a broad range of industries including the automotive, energy, finance, retail, steel, and technology sectors.

Representative experience:*

Multibillion pound litigation brought against Visa in relation to interchange fees in the credit and debit sectors, which culminated in a 12-week trial in the High Court
Proceedings brought on behalf of a global electronics manufacturer arising from the CRT/LCD European Commission decisions
International civil fraud proceedings in the High Court
Proceedings in relation to a breach of warrant of authority and misrepresentation claim
Proceedings brought on behalf of a European power company in connection with losses resulting from the high voltage power cables cartel

*Some of these representations occurred prior to Shereen’s association with Gibson Dunn.

David Debold joined the Washington, D.C. office of Gibson Dunn in 2003. He practices in the Litigation Department, and is a member of the firm’s Appellate and Constitutional Law, Securities Litigation and White Collar Defense and Investigations Practice Groups.

Since joining the firm, David has represented numerous individuals and businesses in a wide variety of white collar, regulatory enforcement, and appellate matters.

David’s white collar and regulatory matters include: major SEC enforcement actions and investigations involving accounting irregularities, the Foreign Corrupt Practices Act, and books and records issues; large-scale corporate internal investigations for Fortune 50 companies (including independent investigations for audit committees of boards of directors); investigations and regulatory actions by FINRA and the PCAOB; and federal criminal investigations and prosecutions involving a number of federal offenses in the environmental, tax, mortgage loan fraud, securities fraud, stock options backdating, money laundering, and antitrust areas.

David’s appellate practice includes federal and state court appeals across a broad spectrum of civil and criminal issues; petitions for writs of certiorari filed in the United States Supreme Court in both civil and criminal cases; and merits appeals in the United States Supreme Court. David’s appellate experience includes more than 85 oral arguments in the United States Courts of Appeals and the briefing of more than 200 appeals.

Representative matters handled by David include:

United States v. Conrad M. Black. David co-wrote the successful petition for writ of certiorari and merits briefs that Gibson Dunn filed in the United States Supreme Court on behalf of media entrepreneur Conrad Black. The Supreme Court unanimously reversed a court of appeals judgment that had upheld Mr. Black’s mail fraud and obstruction convictions. David was lead counsel at Mr. Black’s resentencing on remand in Chicago, and he helped achieve a three-year sentence reduction for Mr. Black.
United States v. Paul S. Minor. David represented Paul Minor, a highly successful lawyer in Mississippi, at his resentencing on honest-services fraud convictions. David persuaded the trial judge to reduce Mr. Minor’s sentence by three years, even after the judge determined there had been no change in the applicable Sentencing Guidelines range.
FINRA Dept. of Enforcement v. Stephen H. Brinck. David played a major role in defending the former head of the fixed income desk at a broker-dealer against fraud charges. Following a 2-week evidentiary hearing in San Francisco and post-hearing briefing, the hearing panel cleared Mr. Brinck of the sole charge levied against him.
Comcast v. FCC. David supervised the briefing among four law firms, as well as the oral argument preparation, in a successful petition to the United States Court of Appeals for the D.C. Circuit. The Court, in rejecting an FCC regulation that limited the size of cable services providers, took the rare step of vacating the rule in its entirety rather than remanding for further proceedings.
United States v. McWane Pipe et al. David took the lead in drafting appellate briefs in the Eleventh Circuit challenging several convictions under the Clean Water Act. The Court reversed all convictions on all counts of all four defendants, and David and his colleagues successfully opposed the Solicitor General’s petition for Supreme Court review of the decision.
David successfully negotiated a non-prosecution agreement for a company that, at the time Gibson Dunn was hired, faced imminent indictment in Michigan for environmental crimes. The agreement avoided prosecution of any individuals and dispensed with appointment of a monitor and other costly remediation measures initially proposed by the EPA. David also successfully negotiated the termination of the 3-year agreement after only 6 months.
In appellate pro bono matters, David took over for a pro se defendant and won a rare remand from the court of appeals for an evidentiary hearing on his claim of racial discrimination in jury selection. He also has taken the lead role in multiple amicus briefs for national criminal defense and immigration advocacy groups before the United States Supreme Court, including a 6-3 victory in Vartelas v. Holder (2012), which protected the travel rights of lawful permanent resident aliens.

David also has significant experience in advising companies on how to create or update their compliance programs to comply with requirements mandated by the United States Sentencing Commission and other authorities. David was Special Counsel to the Sentencing Commission when the guidelines governing corporations took effect, and as Chair of the Commission’s Practitioners Advisory Group he has testified before the Commission on these and other issues related to the enforcement of federal criminal law.

Prior to joining the firm, David served as an Assistant United States Attorney in Detroit, Michigan, where he had a distinguished career in government service as a member of the office’s Criminal Trial and Appellate Divisions. In his years as a trial lawyer for that office, he directed more than 100 grand jury investigations and brought to trial over a dozen felony cases, including a multi-million dollar construction loan fraud, a large-scale investment scam and the attempted murder of a federal agent.

David has lectured frequently at national conferences on criminal law and appellate issues. He served as chair of the United States Sentencing Commission’s Practitioners Advisory Group, which provides input from private practitioners on a variety of sentencing-related issues including proposed amendments to the Federal Sentencing Guidelines and legislative initiatives. He is editor of the ABA’s two-volume treatise, “Practice Under the Federal Sentencing Guidelines,” a comprehensive sentencing resource. He also has written numerous articles on developments in federal sentencing law at the Supreme Court level, as well as updates on Department of Justice policies in the investigation and prosecution of corporations and other organizations. David was recently recognized by Benchmark Litigation as “Litigation Star.” David has also been recognized by The Best Lawyers in America® since 2023 in the categories of Securities Litigation and White-Collar: Criminal Defense.

David graduated magna cum laude from Harvard Law School in 1985, and served as a law clerk to the Honorable Cornelia G. Kennedy of the United States Court of Appeals for the Sixth Circuit.

Marcus Curtis is an associate in the Orange County office of Gibson Dunn, and a member of the firm’s Appellate and Constitutional Law Practice Group.

He served as a law clerk to Judge J. Clifford Wallace of the United States Court of Appeals for the Ninth Circuit, and to Judge Cynthia A. Bashant of the United States District Court for the Southern District of California. He graduated from Yale Law School, where he served as an articles and essays editor for the Yale Law & Policy Review, and a managing editor for the Yale Journal of Law & Feminism.

Marcus earned his undergraduate degree from the United States Naval Academy, after which he served as an officer in the United States Marine Corps. He also holds a graduate degree from Georgetown University and worked as a political-military analyst for the Pentagon, where he focused on China’s defense and foreign policy strategy.

Prior to joining Gibson Dunn, he practiced with a premier global law firm as a member of the securities litigation and antitrust practices.

Marcus is a member of the California bar, and is admitted to practice before the United States Court of Appeals for the Ninth Circuit, and the United States District Courts for the Northern, Eastern, and Southern Districts of California.

Benjamin D. Wilson is Of Counsel in the Dallas office of Gibson Dunn, where he is a member of the firm’s Appellate and Constitutional Law Practice Group.

Ben has presented oral argument in the Texas Supreme Court, the United States Court of Appeals for the Fifth, Second, and Seventh Circuits, and the Texas Appellate Courts. He has also often represented clients before the United States Supreme Court and other state and federal courts of appeals. In addition, Ben often handles critical or dispositive motions in both state and federal trial courts.

Prior to rejoining Gibson Dunn, Ben worked as lead counsel for commercial appellate matters for the world’s largest retailer. Ben also has a distinguished record of public service in state and federal government. As Deputy Solicitor General in the Office of the Texas Solicitor General, he successfully briefed and argued many of the state’s most important appeals and advised on many of the state’s most important trial court matters. As Deputy Assistant Attorney General in the Department of Justice’s Office of Legal Policy, Ben lead for the Department’s efforts to confirm federal judicial nominees, including Justice Amy Coney Barrett and over eighty lower court judges. Earlier in his career, Ben served as Counsel to Senator Ted Cruz on the Senate Judiciary Committee and as Special Counsel to Senator Cruz for the confirmation of Justice Brett Kavanaugh.

Ben clerked for Judge Diarmuid F. O’Scannlain of the United States Court of Appeals for the Ninth Circuit and later for Judge James C. Ho of the United States Court of Appeals for the Fifth Circuit. Ben received his law degree with honors from the University of Chicago Law School and his Bachelor of Arts degree from Washington and Lee University magna cum laude with honors in history.

Ben is a member of the Texas Bar. He is admitted to practice before the Second, Fifth, Seventh, and Ninth Circuits and before the U.S. District Courts for the Northern and Western Districts of Texas.

Aly Cox is an associate in the Washington, D.C. office of Gibson Dunn. She practices in the firm’s Litigation Department.

Aly graduated summa cum laude in 2021 from Notre Dame Law School, where she served as the Managing Articles Editor of the Notre Dame Law Review. Before then, she earned her Bachelor of Science in Biological Sciences from the University of Notre Dame in 2017.

Prior to joining Gibson Dunn, Aly served as a law clerk for Chief Judge William H. Pryor Jr. of the U.S. Court of Appeals for the Eleventh Circuit and Judge Carl J. Nichols of the U.S. District Court for the District of Columbia.

Aly is a member of the District of Columbia Bar and is admitted to practice before the U.S. District Court for the District of Columbia.

Michelle Gery is a litigation associate in Gibson Dunn’s New York City office. She practices in the firm’s Litigation Department.

Michelle earned her Juris Doctor from Columbia Law School in 2024, where she was recognized as a James Kent Scholar. While at Columbia, she was a semifinalist in the Harlan Fiske Stone Moot Court Competition, served on the Columbia Journal of Law & the Arts, and served as a teaching assistant for Corporations.

She graduated from Cornell University in 2021 with a Bachelor of Science in Industrial and Labor Relations, with a minor in Philosophy and a minor in Law & Society.

She is admitted to practice in the State of New York.

Andrea Calla is of counsel in the Abu Dhabi office of Gibson, Dunn & Crutcher, and a member of the Energy, Projects & Infrastructure and Mergers & Acquisitions practice groups.

Andrea’s practice focuses on advising corporations, financial institutions, governments and government-owned entities on a range of energy and infrastructure-related transactions, with a primary focus on upstream, midstream, downstream sectors, greenfield project development, renewables and transitional energy, as well broader corporate matters.

Andrea was recognized as a “Leading Associate” for UAE Oil, Gas and Natural Resources by The Legal 500 EMEA 2025.

Andrea received his undergraduate law degree (LLB) with First-Class Honors from the University of Newcastle, and a postgraduate diploma in legal practice (LPC) with Distinction from Kaplan Law School, London, in association with the Nottingham Trent University.

He is admitted to practice in England and Wales.

Prior to joining Gibson Dunn, Andrea was a corporate associate based in the London and Abu Dhabi offices of a major international law firm. Andrea also completed a secondment to the Abu Dhabi National Oil Company (ADNOC) where he focused on Upstream Oil and Gas.

Katherine Warren Martin is an associate in the San Francisco office of Gibson Dunn. She practices in the firm’s Litigation Department, focusing on high-stakes litigation and investigations, with particular emphasis on antitrust, white collar crime, and class actions.

Representative matters include:

Defending clients involved in confidential investigations by U.S. antitrust enforcement authorities, conducting confidential internal investigations related to antitrust issues, and advising clients on the creation and enhancement of corporate antitrust compliance programs.
Representing companies in complex antitrust litigation in federal court, including manufacturers of lithium ion batteries, auto parts, and food products in multi-district litigations (MDLs).
Representing Facebook in a series of putative class actions and government enforcement actions relating to data privacy issues arising out of the Cambridge Analytica events.

From 2016-2017, and from 2020-2021, Katherine served as a law clerk to the Honorable William H. Orrick, III, of the Northern District of California. She received her Juris Doctor from the University of Michigan in 2015 where she graduated magna cum laude. While in law school, she acted as an Executive Editor for the Michigan Law Review and participated in the 2014-2015 Henry M. Campbell Moot Court Competition where she was awarded Best Petitioner’s Brief in the preliminary round. Katherine earned a B.A. in Economics from the University of California at Los Angeles, in 2011. Prior to law school, she worked for the U.S. State Department’s Office of Foreign Missions in Los Angeles.

Katherine is currently admitted to practice law in the State of California and the United States District Courts for the Northern and Central Districts of California. She is a member of the Antitrust, UCL, and Privacy Section of the California Lawyers Association.