Mark H. Mixon Jr.

Mark H. Mixon, Jr. is Of Counsel in the New York office of Gibson, Dunn & Crutcher and is a member of the firm’s Litigation and Securities Litigation Practice Groups.

Mark is a general corporate and commercial litigator who represents individual and corporate clients in complex, high-stakes business and corporate governance disputes, including commercial breach of contract claims, corporate-control litigation, disputes related to directors’ and controlling stockholders’ fiduciary duties, stockholder derivative and securities litigation, M&A-related litigation, and antitrust and competition law.  He frequently litigates in the Delaware Court of Chancery, where he clerked for the Honorable J. Travis Laster, the Honorable Tamika R. Montgomery-Reeves, and the Honorable Donald F. Parsons, Jr.  Mark has been recognized by Best Lawyers: Ones to Watch® in America for Commercial Litigation, and Litigation – Antitrust (2024-2025). 

Mark maintains an active pro bono immigration practice.  In partnership with Sanctuary for Families, Legal Services NYC, and Immigration Equality, he represents LGBT persons seeking asylum and other forms of immigration relief from U.S. Citizenship and Immigration Services and Immigration Courts.  Mark is also a member of Sanctuary for Families’ Pro Bono Council. 

Mark is admitted to practice in the State of Delaware and the State of New York, and before the United States District Courts for the District of Delaware, the Southern District of New York, and the Eastern District of New York.

Before joining Gibson Dunn, Mark earned his Juris Doctor magna cum laude in 2015 from the University of Pennsylvania Law School, where he was an executive editor of the University of Pennsylvania Journal of Business Law.  He also earned a Master of Education in higher education in 2012 and a Bachelor of Science in Energy Business and Finance in 2011 from the Pennsylvania State University.