Brian Clark

Partner

Brian Clark is a globally recognized antitrust economist specializing in monopolization, merger analysis, and the economics of digital platforms, payment networks, and innovation markets. He joins Keystone as a Partner in its Washington, D.C., office, where he will help anchor the firm's presence in the capital and serve as a senior leader of its antitrust and competition practice.

Brian brings a decade of public service at the forefront of U.S. antitrust enforcement, most recently as Assistant Chief in the DOJ Antitrust Division's Economic Analysis Group and previously as an Economist at the FTC's Bureau of Economics. He was the manager and lead economist on U.S. v. Apple, the DOJ's landmark monopolization case, where the theory of harm he developed survived a motion to dismiss in June 2025. He also served as lead economist on U.S. v. Visa/Plaid, for which he received the Attorney General's Award for Distinguished Service, and on the FTC's challenge to Illumina/Pacific Biosciences, widely cited as a landmark nascent-competition enforcement action.

Brian has led complex matters across industries including technology platforms, payment networks, fintech, biotechnology, defense, transportation, energy, and retail, and is known for translating sophisticated economic analysis into accessible, persuasive arguments for courts and decisionmakers.

Brian is also a recognized leader on diversity and inclusion in the antitrust community. As co-chair of the DOJ Antitrust Division's Diversity Committee, he more than doubled membership and led programming for veterans, new parents, and the AAPI community. He co-founded the annual SOGIE reception at the ABA Antitrust Spring Meeting and received the 2024 Diversity Champion Award.

Education

Ph.D. in Economics from Duke University
B.S. in Economics and Decision Sciences, summa cum laude, from Miami University