Charlie Sim is an associate in the New York office of Gibson, Dunn & Crutcher. He practices in the firm’s litigation department in the Intellectual Property and Antitrust and Competition practice groups.

Charlie received his Juris Doctor from Cornell Law School and his Bachelor of Arts in Economics in from the University of British Columbia. During law school, he served as a judicial intern for the Honorable Ronnie J. Abrams in the United States District Court for the Southern District of New York.

Robert Phillips
(1971 – 2026)

It is with profound sadness that we announce the passing of our partner and friend, Rob Phillips.

Rob was a partner in our San Francisco office, where his practice focused on advising life sciences, medical device, and technology companies. He joined Gibson Dunn in 2020 and served on the firm’s Hiring Committee. As a core member of the firm’s transactional Life Sciences Practice Group, he represented issuers and investors in the pharmaceutical sector—work driven by his deep commitment to advancing therapies that help patients. Rob was regarded as technically excellent, eminently pragmatic, and deeply warm. His humor and kindness made him beloved by colleagues and opposing counsel alike.

A proud double Hoya, Rob graduated from Georgetown University with a Bachelor of Science in Foreign Service in 1994 and from Georgetown University Law Center with a Juris Doctor in 1999. A competitive swimmer in high school and throughout college, he held multiple backstroke records at Georgetown. Having lived in Japan during his formative years, Rob developed a profound appreciation for the country’s culture and became fluent in Japanese.

Rob was an extraordinary colleague and friend to our Gibson Dunn community. Our thoughts are with his family and with the many colleagues who worked with him. He will be greatly missed.

Leonardo Labriola is an associate in the New York office of Gibson, Dunn & Crutcher.

He graduated cum laude from Fordham University School of Law, where he served as editor of the Fordham Law Review, editor of the Fordham Moot Court Board, and vice-president of the Student Bar Association. Leonardo earned Bachelors of Arts degrees, summa cum laude and with distinction, in International Affairs and Philosophy from the University of Colorado.

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

Stephen Olson is widely recognized as one of the leading M&A lawyers in the country. He counsels clients in connection with public and private acquisition and divestiture transactions, complex joint ventures, registered offerings and private placements of debt and equity securities, as well as corporate governance and other general corporate matters. His clients include private equity firms, private and mature public companies, and investment banking firms.

He has worked with clients across a diverse number of industries including chemicals, manufacturing, health care, technology, finance, media, telecommunications, and energy.

Stephen maintains an active pro bono practice and regularly serves as outside legal advisor to one of the largest NGOs in the world. He works with international financial institutions, such as The World Bank and the International Monetary Fund (IMF), on projects related to advancing the rule of law and the safeguarding and stewardship of sovereign wealth in developing nations to help build sustainable infrastructures and improve basic living conditions.

Stephen is heavily involved in the local Houston community, serving on the board of directors of the Friends of West University Place Parks Fund and coaching several youth sports teams.

Recognition

• M&A Advisor, Middle Market Deal of the Year Award (2010)
• M&A Advisor, Sector Deal of the Year ($100 million to $1 billion), technology, media, and telcom category (2012)
• Judge, M&A Advisor International M&A Awards (2015)
• “Rising Star”: New York Metro Super Lawyers (2014-2017) and Texas Super Lawyers (2011, 2013-2017)

Warren Loegering is an associate in Gibson, Dunn & Crutcher’s San Francisco office. He is a member of the firm’s Litigation Department, where he advises clients on a wide range of federal and state court issues. Warren is involved in complex cases in various subject areas including consumer class actions, antitrust matters, and privacy and technology law.

He earned his Juris Doctor in 2019 from Columbia Law School, where he was a member of the Editorial staff of The Columbia Journal of Law & the Arts, a James Kent Scholar, a Harlan Fiske Stone Scholar, a recipient of the 2017 Robert Noxon Toppon Academic Prize for Constitutional Law, and was an editor of the Frederick Douglass Moot Court. Warren earned a B.A. in History and Literature, magna cum laude, from Harvard University in 2012.

Warren remains committed to pro bono service at Gibson, where he represents several clients in immigration proceedings, and drafts amicus briefs for institutional pro bono clients, including a brief on behalf of immigration law scholars before the U.S. Supreme Court.

He is admitted to practice law in the State of California.

Audrey Yang is an associate in the Dallas office of Gibson, Dunn & Crutcher LLP. She is a member of the firm’s Intellectual Property and Appellate and Constitutional Law Practice Groups.

Prior to joining Gibson Dunn, Audrey served as law clerk to the Honorable Alan D. Lourie of the United States Court of Appeals for the Federal Circuit. Before her clerkship, Audrey was an IP litigation associate in the New York office of Kirkland & Ellis LLP.

Audrey earned her law degree from The University of Chicago Law School, where she served as Comments Editor and Topic Access Editor of The University of Chicago Legal Forum. Prior to law school, she worked in the IT risk and security department at JPMorgan Chase & Co. and as an IT risk and cybersecurity consultant with PricewaterhouseCoopers LLP. Audrey graduated cum laude from Cornell University with a Bachelor of Science degree in Electrical & Computer Engineering.

Audrey is a member of the New York and Texas bars and is admitted to practice before the United States Court of Appeals for the Federal Circuit and the United States Patent & Trademark Office.

Celine Leung is an associate in Hong Kong. She is a member of the firm’s Litigation Practice Group.

Celine practices general and civil litigation and dispute resolution, with a particular focus on trust, tax, company and shareholder disputes, contentious probate and estate administration. Prior to joining Gibson Dunn, she trained and practiced at a magic circle firm in Hong Kong, where she had extensive experience advising and acting for professional trustees, multinational companies, financial institutions and high net worth individuals on a wide range of matters.

Celine is presently a member of the Board of Review (Inland Revenue Ordinance), a member of the Civil Celebrant of Marriages Appointment Appeal Board and an adjudicator of the Registration of Persons Tribunal. She is also a contributing editor for the Hong Kong White Book.

Celine received her Juris Doctor from the Chinese University of Hong Kong in 2009, where she was a member of the Dean’s List. She earned a Bachelor of Arts in Economics with honors and a Certificate in Finance from Princeton University in 2007, and a Master of Laws from the University of Melbourne in 2017.

She is admitted to practice in Hong Kong, the State of New York and England and Wales. Celine is fluent in English, Mandarin and Cantonese.

Kendyl Clausen is an associate in the San Francisco office of Gibson, Dunn & Crutcher. She is a member of the firm’s Real Estate Department.

Kendyl received her Juris Doctor from Yale Law School in 2019. While in law school, she practiced in the Ludwig Center for Community & Economic Development. Kendyl earned a Bachelor of Science in Foreign Service from Georgetown University magna cum laude in 2016. In 2014, she was elected to the D.C. Advisory Neighborhood Commission, where she served until 2016.

She is currently admitted to practice law in the State of California.

Viola Li is an associate in the San Francisco office of Gibson, Dunn & Crutcher LLP. She currently practices in the firm’s Litigation Department and maintains an active pro bono practice.

Viola previously served as a law clerk to the Honorable Maxine M. Chesney of the United States District Court for the Northern District of California.

She received her J.D. from Stanford Law School in 2019 with pro bono distinction, where she was a Notes Editor for the Stanford Law Review. While in law school, Viola was a co-leader of the Economic Advancement Program Pro Bono and a team leader for the Environmental Pro Bono. She earned her B.S. in Commerce (Finance) with Distinction and B.A. in Environmental Thought and Practice from the University of Virginia in 2013. Prior to attending law school, Viola was a senior analyst at Cornerstone Research, a litigation consulting firm, where she worked in a variety of practice areas, including antitrust, intellectual property, energy, and securities class actions.

Viola is admitted to practice law in the State of California.

Katie Geary (formerly Henderson) is an associate in the Orange County office of Gibson, Dunn & Crutcher, where her practice focuses on complex commercial litigation at the trial and appellate levels.  She is a member of the firm’s Class Actions, Labor and Employment, Environmental Litigation and Mass Tort, and Appellate and Constitutional Law Practice Groups.

Katie represents clients in a wide range of litigation in federal and state courts. She has represented clients in breach-of-contract, employment, mass tort, and consumer class actions and mass arbitrations, as well as other commercial and business disputes. She has also drafted numerous merits and amicus briefs in the U.S. Supreme Court, federal circuit courts, and all levels of the California appellate courts, and has presented oral argument to the Ninth Circuit.

She earned her Juris Doctor magna cum laude from Pepperdine University School of Law in 2018, where she was elected to the Order of the Coif and Order of the Barristers. While in law school, Katie served as a Literary Citation Editor for the Pepperdine Law Review, an award-winning member of Pepperdine’s National Moot Court Team, and as a Judicial Extern to the Honorable Sandra S. Ikuta of the Ninth Circuit Court of Appeals. She received her Bachelor of Arts degree cum laude in Sociology from Chapman University in 2015.

Katie is a member of the State Bar of California and is admitted to practice in the United States District Courts for the Central, Eastern, Northern, and Southern Districts of California, and the Ninth Circuit Court of Appeals. Katie also maintains an active pro bono practice and has experience representing individuals and organizations with Fourth Amendment and other constitutional law related issues.

Danielle Robertson is an associate in the New York office of Gibson, Dunn & Crutcher and a member of Gibson Dunn’s Real Estate Practice Group. Her practice covers a broad range of complex transactions, including real estate acquisitions and dispositions, financings and joint ventures.

Prior to joining Gibson Dunn, she was a real estate associate in the New York office of Kirkland & Ellis LLP.

Danielle received her Juris Doctor in 2017 from Vanderbilt University Law School, where she served as Student Notes Editor of the Vanderbilt Journal of Transnational Law. She concurrently received her Master of Science in Finance from Vanderbilt University’s Owen Graduate School of Management.

Danielle received her Bachelor of Business Administration in Finance from Southern Methodist University in 2012.

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

Cullinan Williams is a litigation associate in the New York office of Gibson, Dunn & Crutcher.

He received his Juris Doctor, cum laude, from Cornell Law School in 2019, where he was a Myron Taylor Scholar and Editor of the Cornell Law Review. During law school, Cullinan sat on Cornell Law School’s Moot Court Board and represented Cornell at the 2017–2018 American Bar Association Appellate Advocacy Competition.

Cullinan received his Bachelor of Arts, cum laude, from Yale University in 2013, where he majored, with distinction, in both Political Science and History.

Katie Salvaggio is a litigation associate in the New York office of Gibson, Dunn & Crutcher.

She received her Juris Doctor from Columbia Law School, where she was a James Kent Scholar. Katie graduated with distinction from the University of Virginia, where she received her Bachelor of Arts degree in History, with a minor in Foreign Affairs.

From 2019 to 2020, she served as a law clerk to the Honorable Roslynn R. Mauskopf of the United States District Court for the Eastern District of New York.

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

 

Mark Tomaier is an associate in the Orange County office of Gibson, Dunn & Crutcher where he currently practices in the firm’s Litigation Department and is a member of the Environmental Litigation and Mass Tort Practice Group. He represents clients in complex litigation, government investigations, and compliance matters primarily relating to environmental law. He was named by the Environmental Law Institute as a 2022 “Emerging Leader” in environmental law and policy.

His substantive experience includes:

• Representing aerospace company in matter involving alleged trichloroethylene (“TCE”) contamination.
• Representing chemical manufacturing and retail clients in government investigations focused on environmental tort and compliance issues.
• Providing compliance and enforcement counseling addressing Clean Air Act, Clean Water Act, and CEQA in oil and gas operations.
• Providing environmental due diligence in complex transactions.
• Successfully arguing before the Ninth Circuit to obtain reversal of a Board of Immigration Appeals decision that had ordered removal of a United States permanent resident who had been deemed not mentally competent to represent himself.

Mark serves as a co-chair of the firm’s Sustainability Committee and on the Executive Committee of the Environmental Law Section of the Los Angeles County Bar Association. Prior to joining the firm, Mark served as a law clerk to The Honorable Marilyn L. Huff in the United States District Court for the Southern District of California and as a law clerk to The Honorable Michael D. Wilson in the Supreme Court of Hawaii.

Mark earned his law degree cum laude in 2017 from Harvard Law School, where he was an Articles Editor on the Harvard Environmental Law Review. In 2012, he graduated with highest honors from the University of California Berkeley with a Bachelor of Arts Degree, double majoring in English and in Rhetoric. Mark holds a 2022 Certificate in Sustainable Capitalism and ESG from the University of California, Berkeley.

He is a member of the California Bar. Mark is admitted to practice before the United States Court of Appeals for the Ninth Circuit and before the United States District Court for the Central District of California.

Kelley Pettus is an associate in the Denver office of Gibson, Dunn & Crutcher. She currently practices with the firm’s Litigation Department.

Kelley previously served as a law clerk to the Honorable Jay S. Bybee of the U.S. Court of Appeals for the Ninth Circuit.

She graduated with highest honors in 2019 from The George Washington University Law School and was awarded Order of the Coif.  She served as Senior Articles Editor for The George Washington Law Review and as a Writing Fellow and Dean’s Fellow for the law school’s writing program. Kelley received a Bachelor of Business Administration in Marketing from St. Edward’s University, where she graduated summa cum laude with honors.

Kelley is admitted to practice in the state of Colorado and the District of Columbia.

Alayna Monroe is an associate in the Century City office of Gibson, Dunn & Crutcher. She currently practices in the firm’s Litigation Department.

Alayna earned her law degree cum laude in 2019 from Georgetown University Law Center, where she served on the executive board of the school’s Barrister’s Council: Appellate Advocacy Division and participated in the Kids in Need of Defense (KIND) probono project. During law school she also served as an extern for the Natural Resources Defense Council.

Prior to law school, Alayna graduated cum laude from the University of Southern California, earning a Bachelor of Arts in International Relations and minors in Environmental Studies and Spanish.

Alayna is admitted to practice law in the State of California and before the U.S. District Courts for the Central and Northern Districts of California.

Allison Lewis is an associate in the Washington, D.C. office of Gibson, Dunn & Crutcher.

She received her Juris Doctor, cum laude, from Georgetown University Law Center, where she served as an Articles Editor for The Georgetown Law Journal and was a Global Law Scholar. During law school Allison served as an intern from the Office of Foreign Assets Control (OFAC) Counsel at the Treasury Department and for the Office of the Legal Adviser at the State Department. She graduated from the Walsh School of Foreign Service at Georgetown University, where she received a Bachelor of Science in Foreign Service, cum laude, and an Honors Certificate in International Business Diplomacy. Prior to attending law school, Allison was a Legislative Assistant for Congressman Adam Schiff and a financial consultant for a mid-sized consulting firm.

Allison is a member of the District of Columbia Bar.

Katie King is an associate in Gibson, Dunn & Crutcher’s Washington, D.C. office and a member of the firm’s Litigation practice group, in which she predominantly handles White Collar Criminal Defense and Labor and Employment matters.

Prior to joining Gibson Dunn, she served as a Judicial Intern to the Honorable Evan J. Wallach of the Court of Appeals for the Federal Circuit.

Katie received her J.D. from University of Pennsylvania Law School in 2018, where she served as Editor-in-Chief of the Journal of Constitutional Law and Co-Director of the Civil Rights Law Project. While at Penn Law, she externed at the Philadelphia District Attorney’s Office, where she handled preliminary hearings in felony matters, evidentiary motions hearings, and misdemeanor trials. Katie was also a member of Penn Law’s chapter of the American Inns of Court. She graduated summa cum laude from Rutgers University with a B.A. in political science.

She is admitted to practice in the District of Columbia and Maryland.

Ed Batts is a corporate partner in Gibson Dunn’s Palo Alto office. For 25 years, he has counseled technology clients, including in the semiconductor supply chain; enterprise software and cloud; hardware and devices; 5G and satellite; and large-cap enterprises that engage in many of these sub-verticals at once.

In technical expertise, Ed focuses on mergers and acquisitions, including cross-border transactions, spin-offs, tender offers, and going private transactions. He also counsels public companies on corporate governance and fiduciary duties, as well as crisis management on cyber-security and internal investigations, activist investor situations, and accounting issues. He has significant experience in equity capital markets and venture capital transactions.

Ed has been named multiple times both a BTI Client Service All Star and an Acritas/Thomson Reuters Star, and has been recognized by Best Lawyers for his work in corporate law. He is a member of the American Nuclear Society and published author on nuclear waste issues. He also is a military officer veteran and former U.S. federal special agent.

Ed received his law degree from Stanford Law School in 1998 and earned his B.A. from the University of California, Los Angeles, summa cum laude, in 1995.

Nicole Matthews is an associate in the Los Angeles office of Gibson, Dunn & Crutcher. She currently practices in the firm’s Litigation Department.

Nicole received her law degree from the University of California, Berkeley, School of Law in 2019. While in law school, she served as Senior Publishing Editor of Ecology Law Quarterly and participated in the Environmental Law Clinic. Nicole also served as Co-Director of the 2018 Bales Trial Competition and was the winner of the 2017 Bales Trial Competition.

She holds a Bachelor of Arts degree in Political Science and a minor in Environmental Studies from the University of Southern California, where she graduated magna cum laude and was elected to Phi Beta Kappa.

Nicole is admitted to practice in the State of California and before the U.S. District Court for the Central District of California and Northern District of California.