Yama Keshawerz is an associate attorney in the Denver office of Gibson Dunn. He currently practices in the firm’s Litigation Department, and has represented clients in matters related to corporate governance and mergers & acquisitions litigation.
Yama earned his Juris Doctor and Master of Laws degrees from Duke Law School. He also has a Master of Laws from Wake Forest University School of Law and a Bachelor of Arts in Law and Political Science from Alberoni University. At Duke Law School, Yama served as a staff editor of the Duke Journal of Comparative & International Law and attended the Duke–Leiden Institute on Global and Transnational Law in The Hague, the Netherlands.
Prior to joining Gibson Dunn, Yama helped clients with business immigration matters, worked as a Consular Affairs Officer at an embassy in Washington, DC, and served as a Visiting Scholar at Stanford Law School.
Yama is admitted to practice law in Colorado, New York, and Washington, DC.
Allyson N. Ho is co-chair of the Firm’s nationwide Appellate and Constitutional Law practice group and partner in the Dallas office of Gibson, Dunn & Crutcher.
She has presented over 100 oral arguments in federal and state courts nationwide, including six high-stakes business cases before the U.S. Supreme Court.
Chambers has called her “undoubtedly one of the premier appellate lawyers in the United States”—“a magician” who “creates paths to victory that others do not see”—and ranked her among leading appellate advocates every year for the past 15 years. Benchmark Litigation has named her one of the “Top 250 Women in Litigation,” a “Litigation Star,” and shortlisted her for “Appellate Litigator of the Year.” She is one of the few appellate lawyers nationwide named to the BTI Client Service All-Stars List, recognized by corporate counsel for “delivering the absolute best in client service.” Since 2015, Allyson is recognized in The Best Lawyers in America guide for Appellate Practice. Most recently, Lawdragon named her to its 2025 500 Leading Litigators in America guide, which highlights “the best litigators the U.S. has to offer.”
The American Lawyer has recognized her in its “Litigators of the Week” column every year for the past four years. The National Law Journal has repeatedly featured her on its “Appellate Hot List.” Law360 has honored her as an “Appellate MVP,” “Litigation Powerhouse,” and leading member of the “Employment Group of the Year.” Texas Lawyer has recognized her as a “Distinguished Leader,” “Attorney of the Year Finalist,” leading member of a “Litigation Department of the Year,” and one of the state’s most “Winning Women.”
Federal and State Appellate Practice
Allyson has argued significant business cases before the U.S. Supreme Court in the areas of bankruptcy, patents, ERISA, employment, and administrative law. She has appeared before every federal court of appeals in the country, including en banc arguments before the Fourth, Fifth, and Sixth Circuits, and successfully represented businesses in every federal circuit. She also regularly represents businesses in state appellate courts across the country, including the Texas Supreme Court, Texas appellate courts in Dallas, Houston, Austin, San Antonio, Corpus Christi, and Eastland, and state appellate courts in Arizona, Michigan, New York, Ohio, Oklahoma, and West Virginia.
Her most significant wins include multiple U.S. Supreme Court decisions overturning decades-old precedent opposed by the business community, several multi-billion dollar and nine-figure reversals in both federal and state appellate courts across the country, and critical class certification reversals and significant constitutional rulings.
National Law Journal called her a “Veteran SCOTUS Advocate” in the “upper echelons of Supreme Court practice.” Law360 named her a “Supreme Court Star” and “one of the nation’s preeminent appellate lawyers.” And EmpiricalSCOTUS.com ranked her among “the most successful attorneys that currently practice before the Court.”
She once argued two significant business cases before the Court within the span of 21 days—including a “significant ruling for employers” that “paved a new path for companies paying millions of dollars in retiree health care benefits” (Law360), and a landmark administrative law dispute in which “several justices agreed with Ho’s contention that SCOTUS should revisit and overrule its own precedent” (Law360). She prevailed against the EEOC in a case that the employment defense bar called “good news for employers across the country.” And in “the most important patent case in modern history” according to patent law experts, her argument before the Court was credited for “pick[ing] up two votes that pundits thought unreachable.”
Government and Public Service Experience
Allyson has a distinguished record of experience at the highest levels of the federal government. She served as Special Assistant to President George W. Bush, Counselor to Attorney General John Ashcroft, and law clerk to Justice Sandra Day O’Connor of the U.S. Supreme Court and Judge Jacques L. Wiener Jr. of the U.S. Court of Appeals for the Fifth Circuit.
Her record of public service also includes appointments to various boards and commissions, including the Administrative Conference of the United States, the United States Supreme Court Historical Society, the Texas Supreme Court Historical Society, the Federalist Society Board of Visitors, and the Washington Legal Foundation Legal Policy Advisory Board. She is vice chair of the Federal Judicial Evaluation Committee, appointed by U.S. Senators John Cornyn and Ted Cruz to evaluate potential appointments of all federal judges and U.S. Attorneys in Texas. She has also served on the U.S. Magistrate Judge Merit Selection Panel for the Northern District of Texas. She has testified before Congress on issues of importance to the business community.
Other Background Information
An active pro bono litigator, Allyson works most frequently with First Liberty Institute, the National Organization for Victim Assistance, and the National Crime Victim Law Institute. Her amicus briefs have been repeatedly cited in multiple Supreme Court opinions and during oral argument.
She graduated from Duke University magna cum laude with a B.A. in English, Rice University with an M.A. and Ph.D. in English Literature, and the University of Chicago Law School with high honors. She was a member of the Law Review and Order of the Coif. She and her husband Jim, a federal judge, have a twin daughter and son.
Abby Walters is an associate in the Washington, D.C. office of Gibson, Dunn & Crutcher, where she practices in the firm’s Litigation Department.
Abby clerked for the Honorable Gerald B. Tjoflat on the United States Court of Appeals for the Eleventh Circuit and for the Honorable John B. Nalbandian on the United States Court of Appeals for the Sixth Circuit. Prior to clerking, Abby graduated cum laude from the Georgetown University Law Center, where she served as a Notes Editor on the Georgetown Journal of Legal Ethics and as a Co-Director for the Appellate Advocacy Division of Barristers’ Council. While in law school, Abby represented clients as a student attorney in the Appellate Litigation Clinic, arguing before the United States Court of Appeals for the Fourth Circuit, and served as a judicial extern to the Honorable Amy Berman Jackson on the United States District Court for the District of Columbia.
Abby graduated summa cum laude from the University of Alabama in 2018, where she majored in Foreign Languages and Literature with an emphasis in Latin and minored in Spanish.
Abby is admitted to practice in New York, the District of Columbia, and the Sixth Circuit.
Connie Lee is an associate in the Washington, D.C. office of Gibson, Dunn & Crutcher. She practices in the Litigation group with a focus on antitrust and competition, where she represents clients in high-stakes litigation matters, including at the trial stage.
Representative matters include:
- Member of the trial team representing Community Health Systems in FTC v. Novant Health (W.D.N.C.), which defeated the FTC’s motion for a preliminary injunction.
- Represented the claimant, a financial services company, in an antitrust arbitration alleging conduct claims.
- Representing a medical equipment manufacturer in a competitor lawsuit alleging monopolization claims.
- Representing a pharmacy benefit manager in a proceeding before the FTC.
Connie also maintains an active pro bono practice and served as the lead attorney in winning a grant of asylum for a client in an immigration court hearing in 2022.
She received her Juris Doctor from Columbia Law School, where she was a Harlan Fiske Stone Scholar and served as a Note Editor on the Columbia Human Rights Law Review. She received her Bachelor of Arts degree from Dartmouth College in Government and Philosophy. During law school, Connie served as a judicial extern to the Honorable Raymond J. Lohier of the United States Court of Appeals for the Second Circuit.
Connie is admitted to practice law in the District of Columbia.
Manahil Zafar is an associate attorney in the New York office of Gibson, Dunn & Crutcher.
Manahil received her Juris Doctor from the University of Michigan Law School, where she served as a student attorney with the Human Trafficking Clinic, research assistant to Professor Patrick Barry, and President of the Asian Pacific American Law Students Association. She graduated, magna cum laude, with a Bachelor of Arts in Journalism and Psychology from New York University, where she was elected to Phi Beta Kappa.
Manahil is admitted to practice in the State of New York.
Shri Dayanandan is an associate in the Palo Alto office of Gibson Dunn. She practices in the firm’s Litigation Department.
Shri received her Juris Doctor from University of Virginia School of Law, where she served on the Articles Review Board for the Virginia Journal of Law & Technology, and as President of the Emerging Companies and Venture Capital Society. Shri also served as a research assistant to Professor Richard J. Bonnie assisting with revisions to the Restatement of Children and the Law, and as a research assistant to Professor Richard M. Re, researching the implications of the use of generative AI in judicial opinions. She received her Bachelor of Science degree from Northeastern University in Biology and Political Science.
She is admitted to practice in the State of California.
Jillian N. Katterhagen is an associate in the Washington, D.C. office of Gibson Dunn. She practices in the firm’s Litigation Department with a particular focus on white collar defense investigations, complex commercial litigation, global anti-corruption matters, and congressional investigations.
Jillian has experience representing financial institutions and multinational companies in investigations conducted by the Securities and Exchange Commission, the Department of Justice, and the United States Congress. She has conducted internal investigations involving alleged securities and accounting fraud, violations of the Foreign Corrupt Practices Act, violations of anti-money laundering laws, and violations of the False Claims Act. Additionally, Jillian has significant litigation experience and has represented clients in proceedings before administrative agencies.
She received her law degree from Stanford Law School in 2018. She served as an Editor for the Stanford Law and Policy Review, and as a student attorney in Stanford’s Immigrants’ Rights Clinic, where she advocated on behalf of clients seeking legal advice in connection with asylum applications and other immigration matters. Jillian graduated magna cum laude from Washington and Lee University, where she was elected to Phi Beta Kappa, earned a B.A. in history and politics, and served as the captain of the women’s track and field team.
Jillian is admitted to practice in the District of Columbia.
Spencer Becerra is an associate in the New York office of Gibson Dunn.
He graduated a James Kent Scholar from Columbia University School of Law in 2024, where he served as a member of the Mediation Clinic and The Columbia Journal of Law & the Arts. Spencer received his Bachelor of Arts in English from The George Washington University in 2020.
He is admitted to practice in the state of New York.
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Melanie Neary is a partner in the San Francisco office of Gibson Dunn where she practices in the firm’s Capital Markets Practice Group, focusing on representing leading life sciences companies and investors. Melanie advises clients on a wide range of complex financing transactions and matters, including initial public offerings, secondary equity offerings, and venture and growth equity financings, as well as mergers and acquisitions, spin-offs, and PIPEs. Melanie regularly serves as principal outside counsel for numerous publicly-traded companies and advises management and boards of directors on corporate law matters, Securities and Exchange Commission reporting requirements and ownership filings, and corporate governance. Representative Clients and Transactions:
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Melanie received her J.D. from the University of Michigan Law School in 2016, where she was the Managing Editor of the Michigan Business & Entrepreneurial Law Review. She earned her B.A., magna cum laude, in Communications, Legal Institutions, Economics and Government, with a minor in French, from American University in 2013.
Trey Shomin is an associate attorney in the Denver office of Gibson, Dunn & Crutcher. He is a member of the firm’s Litigation Department.
Trey earned his J.D. from the University of Michigan Law School in 2024. Prior to law school, he graduated magna cum laude from Grand Valley State University where he earned a Bachelor of Business Administration degree in Marketing from the Seidman College of Business.
Trey is admitted to practice law in Colorado.
Ariel Fishman is an associate in the Washington, D.C. office of Gibson Dunn, where she practices with the firm’s Litigation Department and specializes in intellectual property.
Ariel’s practice includes litigating complex trademark and copyright matters. Representative matters include:
- Key member of the trial team defending a beverage company’s use of its trademark, pursuing extensive fact and expert discovery before the case was successfully resolved;
- Briefed novel copyright and fair use issues in a bench trial representing a leading enterprise resource planning software support company;
- Key member of the trial team in a private arbitral trial, including taking direct examination of two fact witnesses;
- Advised media client on potential First Amendment exposure and defenses;
- Secured asylum award for individual who fled El Salvador while a minor to escape persecution.
Ariel clerked for Judge Karen LeCraft Henderson on the U.S. Court of Appeals for the D.C. Circuit. She received her J.D., cum laude, from Harvard Law School, where she served as Executive Editor for the Harvard Law Review. Ariel received her undergraduate degree with general honors in art history and English literature from the University of Chicago.
She is admitted to practice in the District of Columbia.
Publications
- Note, Textualism’s Mistake, 135 Harv. L. Rev. 890 (2022)
- Recent Case, Save America’s Clocks v. City of New York, 133 Harv. L. Rev. 1790 (2020)
- Free Speech and Advertising Regulation (Missouri Broadcasters Association v. Schmidt), 2019 Jus Vini: J. Wine & Spirits L. 47 (coauthored)
Owen Alderson is a corporate associate in the New York office of Gibson Dunn, where his practice focuses on Private Equity and Mergers and Acquisitions. He is currently on secondment.
He received his Juris Doctor from the University of Pennsylvania Law School in 2020, where he served as the Online Managing Editor for the University of Pennsylvania Journal of Constitutional Law and was awarded the law school’s Distinguished Pro Bono Award. Owen received his Bachelor of Fine Arts, magna cum laude, in Drama from the University of Cincinnati College-Conservatory of Music in 2017.
Prior to joining Gibson Dunn, Owen was an associate in the Corporate Department of another international law firm in New York.
He is admitted to practice in the State of New York.
Simone Benton is a senior counsel in the London office of Gibson, Dunn & Crutcher and is a member of the Business Restructuring and Reorganization and Finance Practice Groups.
Simone has broad experience advising across a range of multi-jurisdictional restructuring matters and financings. She is responsible for developing and implementing the internal and external knowledge and training strategy for the London Business Restructuring and Reorganization team.
Simone’s experience includes advising:
- Fidera, as the largest creditor in the Part 26A restructuring plan of the Project Fürst development in Berlin
- The junior creditors in the contested proceedings to restructure Virgin Active using a Part 26A Plan
- Certain Senior Lenders to Danaos in connection with its debt restructuring and NatWest Group on the disposal of its shareholding in Danaos in an off-market privately negotiated share sale to Danaos
- Rhône Capital on English law financing aspects of its acquisition of Zodiac Pool Holding SA from a fund affiliated with the Carlyle Group for approximately $1.2 billion
- Altran Technologies on its definitive agreement and plan of merger pursuant to which Altran agreed to acquire Aricent from a group of investors led by KKR for a total enterprise value of $2.0 billion, in an all-cash transaction.
Before joining Gibson Dunn, Simone worked at another major international law firm in London. Simone is admitted to practice in England and Wales and Alberta, Canada (inactive).
Simone received her Bachelor of Arts (Honours) in Political Studies and Bachelor of Laws from Queen’s University in Kingston, Ontario, Canada.
Simone’s recent publications include:
- Killer NDAs: NDAs that kill a creditor’s restructuring options, Global Turnaround May 2023
- Sequana: Have directors been given a chance to score an own goal? Global Turnaround December 2022
- “Restructuring Law and Practice: Third Edition,” LexisNexis, 2022
Stephanie Collins is a Senior Associate and English law qualified solicitor advocate in Gibson Dunn’s London office. She is a member of the firm’s Geopolitical Strategy and International Law, International Arbitration, ESG: Risk, Litigation, and Reporting, and Judgment and Award Enforcement Practice Groups. She has particular experience guiding clients in the energy, infrastructure, mining, financial services and tech sectors.
Stephanie specialises in public international law, and advises clients on a broad range of matters, including international human rights law and climate change law. She has recently advised a State on the establishment of a new international organization.
Stephanie also regularly offers strategic guidance to clients on geopolitical risk management. This includes advising on developing jurisprudence, regulation and policy which may impact clients’ operations. She represents corporate actors in human rights-related disputes, including before the European Court of Human Rights and UN Treaty Bodies.
In the international arbitration space, Stephanie has extensive experience of acting in investor-State proceedings under the ICSID and UNCITRAL Rules, as well as experience of commercial arbitration disputes under the ICC, LCIA, Ciarb and SIAC Rules. She has acted in over ten Energy Charter Treaty arbitrations and numerous BIT proceedings, where she has gained advocacy experience. Stephanie is the co-founder and Chair of Young EFILA (European Federation of International Investment Law and Arbitration) and a member of the International Law Association, British Branch. She has previously served as member of CPR’s Young Leaders in ADR Steering Committee (2021-2024), as well as the Global Steering Committee for the Campaign for Greener Arbitrations (2022-2024).
An experienced business and human rights lawyer, she has experience representing clients in civil litigation proceedings with a human rights and environmental nexus; advising clients on climate change and greenwashing risks as well as supply chain risks; and acting in proceedings brought under the OECD Guidelines before National Contact Points. She also advises on a host of ESG-related regulations and delivers strategic advice such as designing human rights policies, due diligence processes and grievance mechanisms, as well as heat-mapping sustainability regulatory developments. She has been an active member of the Business and Human Rights Lawyers Association—of which Gibson Dunn is a founding member—since its inception.
Stephanie is recognised by Legal 500 as a “key lawyer” for Public International Law, International Arbitration and ESG Risk Advisory.
She regularly publishes and speaks on topics relating to public international law, international arbitration and business and human rights issues, and has guest lectured at Queen Mary University of London, as part of the Energy and Resources LLM.
Stephanie maintains an active pro bono practice and is a member of the London office’s pro bono committee. Her practice centres on human rights and public international law issues, and clients she has acted for include the Public International Law and Policy Group. She was trustee for a London-based women’s empowerment charity for over six years until 2024.
Prior to joining Gibson Dunn, Stephanie trained and practised in the London office of a magic circle law firm. During this time, she spent time in the firm’s Madrid and Singapore offices. She was also seconded to the litigation / arbitration team of a multinational energy company for nine months in 2017 / 2018.
Stephanie holds a First-Class Honours degree in Law from University College London (2011). She spent one year studying at the National University of Singapore.
Andrew Cheng is a partner in the Los Angeles office of Gibson Dunn and a member of the firm’s Business Restructuring and Reorganization Practice Group.
Andrew’s practice focuses on representing ad hoc lender groups in a broad range of financing matters, including liability management transactions, debt restructurings, and special situations.
He also regularly advises borrowers, private equity sponsors, and lenders in acquisition financings and other leveraged finance transactions as well as pharmaceutical companies in senior secured credit facilities and royalty financings.
Widely recognized for his debt financing expertise, Andrew is ranked by Chambers USA for his work in Banking & Finance.
Representative Clients and Transactions:
- Liability Management Transactions: Diamond Sports Group, Loparex, and Serta
- Term Lender Groups: Alvogen Pharmaceuticals, Anuvu (Global Eagle), and TNT
Andrew received his J.D. from Harvard Law School in 2000 and graduated magna cum laude with a B.A. from Amherst College in 1997.
Alexandra M. Davidson is an associate in the New York office of Gibson Dunn. She is a member of the Global Finance and the Transportation and Space Practice Groups.
Alexandra concentrates her practice in transport finance with a special focus on aviation related transactions. She advises clients on purchasing, selling, leasing and lending and financing aircraft, aircraft engines and locomotives.
Alexandra was recognized in the 2023 and 2024 edition of Best Lawyers: Ones to Watch® in America for Transportation Law.
Alexandra received her law degree from Maurice A. Deane School of Law in 2014, and a Bachelor of Science degree in Mechanical Engineering from the Binghamton University, State University of New York. Prior to joining Gibson Dunn, Alexandra was a member of the Global Transportation Finance team at an international law firm.
Kamia is an associate in the Los Angeles office.
Her practice currently includes advising clients on qualifying projects for federal income tax credits; the federal income tax aspects of mergers, acquisitions, and equity offerings; and international trade compliance matters.
Kamia earned her J.D. from Duke University School of Law, where she served as a legal extern with Duke University’s Office of Counsel. She received her B.S. in Business Administration from the University of Southern California Marshall School of Business.
She is admitted to practice in the State of California.
Robyn E. Zolman is partner in charge of the Denver office of Gibson Dunn, where she practices in the firm’s Capital Markets and Securities Regulation and Corporate Governance Practice Groups. Robyn represents clients in connection with a broad range of capital markets transactions. She advises clients with respect to SEC registered and Rule 144A offerings of investment grade, high-yield and convertible notes, as well as initial public offerings, follow-on equity offerings, at-the-market equity offering programs, PIPE offerings and issuances of preferred securities. In addition, she has extensive experience with tender offers, exchange offers, consent solicitations and corporate restructurings. Robyn also regularly advises clients regarding securities regulation and disclosure issues and corporate governance matters, including Securities and Exchange Commission reporting requirements, stock exchange listing standards, director independence, counseling boards of directors, and insider trading compliance. She provides disclosure counsel to clients in a number of industries, including energy, life sciences, home building, consumer products and telecommunications.
Robyn is ranked by Chambers USA for Energy & Natural Resources – Colorado. She has been listed in Best Lawyers in America® – Denver Corporate Law, Securities / Capital Markets for many years, and was named a 2021 Lawyer of the Year for Securities/Capital Markets Law, Denver. She is also listed as a Notable Practitioner for Debt and Equity Capital Markets by IFLR1000 and has been recognized as a Top Lawyer: Securities by 5280 Magazine for many years. Additionally, Robyn has been selected as a “Next Generation Lawyer in Capital Markets: Debt Offerings” by The Legal 500 U.S. and has received accolades from Lawdragon and Women in Business Law, among others. She has been named a Top Woman in Energy multiple times by the Denver Business Journal and to its Who’s Who in Energy list and was one of the Denver Business Journal’s 40 under 40 in 2017. In 2015, Law360 selected Robyn as one of eight “Rising Star” capital markets attorneys under 40 to watch nationwide.
Her recent and ongoing experience includes:
Capital Markets Transactions
- Advising The Williams Companies on numerous issuances, tender offers and exchange offers involving over $60 billion of debt and equity securities, including its 2024 issuances of $1.5 billion aggregate principal amount of Senior Notes across three tranches and $2.2 billion aggregate principal amount of Senior Notes across two tranches.
- Advising Atmos Energy Corporation on issuances of over $10 billion of debt securities and $7 billion of shares of common stock in numerous transactions, including registered debt issuances, at-the-market equity offerings and equity forward sale transactions.
- Advising D.R. Horton, Inc. on issuances of over $6 billion of debt securities in numerous transactions, including most recently its issuance of $700 million aggregate principal amount of 5.000% Senior Notes due 2034.
- Advising Advanced Energy Industries, Inc. on the issuance of $575 million aggregate principal amount of its Convertible Senior Notes due 2028.
- Advising Vail Resorts, Inc. on the issuance of $600 million aggregate principal amount of its $6.500% Senior Notes due 2032.
- Advising Jabil Inc. on numerous issuances of senior notes, including its inaugural green bond offering.
- Advising Forestar Group Inc. on issuances of $1.4 billion of debt and equity securities, including through at-the-market equity offering programs.
- Advising Zayo Group on its initial public offering and numerous debt issuance and liability management transactions.
- Advising numerous life sciences and pharmaceutical companies with respect to issuances of common stock and pre-funded warrants.
Corporate Counseling
- Advising publicly traded clients across various industries regarding SEC reporting, securities regulatory matters and corporate governance.
- Advising boards of directors of publicly traded companies regarding governance matters and significant transactions.
Strategic Transactions
- Advising publicly traded clients with respect to spin-offs and IPO carve out transactions.
- Advising publicly traded clients with respect to corporate restructurings, including MLP simplification transactions.
- Advising publicly traded clients with respect to acquisitions and divestitures and related financings.
Robyn graduated cum laude from Harvard Law School in 2002, where she served as an executive editor of the Harvard Law Review. She received a Bachelor of Arts degree in Political Science and Environmental Studies summa cum laude from the University of Colorado in 1999.
Joshua Lipton is a partner in the Washington, D.C. office of Gibson Dunn. He maintains a broad-based antitrust and consumer protection practice, including litigation in state and federal courts, merger and acquisition investigations, civil and criminal antitrust and consumer protection investigations by government authorities, and antitrust counseling.
Josh has been listed as a leading antitrust lawyer in a number of publications, including Chambers USA: America’s Leading Lawyers for Business, Practical Law Company’s Competition: The Law and Leading Lawyers Worldwide, and Super Lawyers in its Antitrust Litigation and Mergers & Acquisitions categories. Lawdragon named him to its “500 Leading Litigators in America” (2023-2025) and “500 Leading Antitrust and Competition Lawyers” for 2025, featuring attorneys who excel representing principally corporations and other organizations in litigating claims. He was recognized by Who’s Who Legal Competition in 2023 and 2024, and has also been ranked as a “Client Service All-Star” by BTI Consulting.
Josh’s representative matters include:
- In re MultiPlan Health Insurance Provider Litigation (N.D. Ill. 2025). Representing UnitedHealth Group in defending multidistrict class action antitrust claims alleging a conspiracy among managed care organizations to use MultiPlan’s services to systematically underpay benefits for visits to out-of-network providers.
- Nielsen / NCS / Circana (2025). Lead counsel for Nielsen and NCS in seeking FTC clearance for the sale of advertising targeting and measurement businesses to Circana.
- SES / Intelsat (2025). Lead counsel for SES in seeking clearance from DOJ and competition authorities on six continents for the acquisition of Intelsat, a global satellite competitor.
- FTC v. Novant and Community Health Systems (W.D.N.C. 2024). Member of trial team representing CHS that secured district court order rejecting the FTC’s attempt to enjoin Novant’s acquisition of two suburban Charlotte hospitals from CHS.
- ExxonMobil / Pioneer Natural Resources (2024). Represented Pioneer in securing FTC clearance for ExxonMobil’s $64.5 billion acquisition of Pioneer, which created the largest oil and gas producer in the Permian Basin.
- OJ Commerce, LLC v. KidKraft, Inc. (S.D. Fla., 11th Cir. 2022). Led the team that secured summary judgment on behalf of KidKraft and MidOcean Partners, and a unanimous affirmance by the Eleventh Circuit, on monopolization and unfair competition claims brought by a disgruntled former distributor.
- Maderazo v. Baptist Health Systems et al. (W.D. Tex. 2019). Defended Tenet Healthcare in class action alleging that three hospital systems in San Antonio conspired to suppress nurses’ wages. The court excluded the opinions of the plaintiffs’ class certification expert relating to antitrust impact and denied the plaintiffs’ motion for class certification.
- In re: Aetna UCR Litigation (D.N.J. 2018). Defended Aetna in a multidistrict class action asserting claims under antitrust, RICO, ERISA, and state consumer protection laws based on allegations that Aetna systematically underpaid benefits for visits to out-of-network providers by using a supposedly rigged database of provider charges. In 2018, the court denied the plaintiffs’ motion for class certification. Shortly afterward, the plaintiffs voluntarily dismissed their claims with prejudice.
- AT&T / Time Warner (D.D.C. 2018). Member of the trial team that defeated the DOJ’s challenge to AT&T’s $85.4 billion purchase of Time Warner.
- Leegin Creative Leather Prods., Inc. v. PSKS, Inc., 551 U.S. 877 (2007). Authored the briefs to the Supreme Court on behalf of Leegin in this landmark case in which the Supreme Court overturned the century-old per se rule against resale price maintenance.
Josh received his law degree, magna cum laude, from the University of Michigan School of Law in 1998, where he graduated first in his class and was a member of the Michigan Law Review. He earned a Bachelor of Arts degree, cum laude, from Amherst College in 1994. Josh is admitted to practice in the District of Columbia.
Sarah H. Roberts is an associate in the San Francisco office of Gibson Dunn. She is a member of the firm’s Litigation Department.
She earned her Juris Doctor, with Honors, from The University of Chicago Law School in 2024. While at the University of Chicago, Sarah was the Executive Comments Editor of the Business Law Review, the co-director of the Law School Musical, and worked with Eric A. Posner on antitrust research and publications. She also represented clients in eviction court as a clinical student in the Poverty and Housing Law Clinic, and her pro bono practice at the firm emphasizes issues related to housing access.
Sarah earned her bachelor’s degree in Linguistics from the University of California, Berkeley in 2020, where she graduated magna cum laude with the Department Citation. Prior to attending law school, Sarah taught middle and high school in the South Bay.
Sarah is admitted to practice law in California.