Professor Sean Sullivan joined the faculty of the College of Law in 2017. His research involves core questions in antitrust and evidence law—questions like why market shares tell us anything about market power and what it means for a jury to find the truth of a disputed fact. He also studies markets, negotiation, and small-sample statistical methods as an experimental economist.

Before joining the faculty, Professor Sullivan served as an antitrust attorney at the Federal Trade Commission in Washington, DC. His practice focused primarily on the review and litigation of mergers in technology and commodity-chemical spaces.

In addition to law, Professor Sullivan holds advanced degrees in economics and statistics. He is a senior editor of the (peer reviewed) Antitrust Law Journal. He is also a researcher and administrator for the VeconLab Experimental Economics Laboratory associated with the University of Virginia.

Recent publications include: 

• Deepest Fakes (with M. Diamantis and E. Alshanetsky), 94 Geo. Wash. L.. Rev. (forthcoming)
• Cases and Materials on U.S. Antitrust in Global Context (with E. Fox and D. Crane) (2025)
• The Decline of Coordinated Effects Enforcement and How to Reverse It (with D. Sokol), 76 Fla. L. Rev. 265 (2024)
• The 2023 U.S. Merger Guidelines – A Review (Sean Sullivan ed., 2024)
• Against Efforts to Simplify Antitrust, 49 J. Corp. L. 419 (2024)
• Antitrust Time Travel: Entry & Potential Competition (with H. Su), 85 Antitrust L.J. (2023)
• Modular Market Definition, 55 U.C. Davis L. Rev. 1091 (2021)
• The Logic of Market Definition (with D. Glasner), Antitrust L.J. (2020)
• Insincere Evidence (with M. Gilbert), 105 Va. L. Rev. (2019)

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