Mark J. Gidley White & Case


Mark Gidley is a partner in White & Case’s Washington, D.C. office and chairs the firm’s Global Antitrust/Competition practice. His practice focuses on mergers and acquisitions, cartel cases, class actions, and pharmaceutical antitrust cases, with an emphasis on trying antitrust cases. Mr. Gidley served as the Acting Assistant Attorney General for the US Department of Justice (DOJ) Antitrust Division in 1992–1993 with responsibility for all civil, criminal and merger matters of the Division. Prior to that, he served as Deputy Assistant Attorney General for Regulated Industries in the Antitrust Division from 1991-1992, responsible for civil, criminal, and merger matters in the telecommunications, energy, computers, intellectual property, and banking and finance industries. From 1990 to 1991, Mr. Gidley served as Associate Deputy Attorney General under then Deputy Attorney William P. Barr. During his tenure at the Antitrust Division, he worked on a number of merger and acquisition investigations, including Bank of America’s acquisition of Security Pacific National Bank and worked on the development of the seminal DOJ-FTC 1992 Horizontal Merger Guidelines. Mr. Gidley was selected and served on the ABA Antitrust Section’s Blue Ribbon Panel for Civil Jury Instructions in Antitrust Trials in 2014-15. He received his B.S. and B.G.S. from University of Kansas in 1983 and his J.D. from Columbia Law School in 1986.

2021 Awards

2020 Awards


Nominee, 2021 Antitrust Writing Awards: Business, Intellectual Property

Nominee, 2020 Antitrust Writing Awards: Business, Intellectual Property

Nominee, 2019 Antitrust Writing Awards: Business, Asian Antitrust

Winner, 2016 Antitrust Writing Awards: Academic, Procedure

Nominee, 2012 Antitrust Writing Awards: Business, Mergers

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