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Ann O'Brien is a partner and co-leader of the firm's Antitrust and Competition Practice Group. She also leads the firm’s Criminal Antitrust and Cartels team. Ann is based in the firm's Washington, D.C. office.

On April 3, 2023, the Department of Justice (the “DOJ”) filed a civil complaint against Activision Blizzard Inc. (“Activision”) alleging that the “competitive balance tax” constituted an unreasonable restraint of trade under Section 1 of the Sherman Act,[1] and entered into a proposed consent decree (a binding settlement) that, if approved by a court, would bar the gaming company from imposing a “tax” against its esports leagues that exceed spending limits on player compensation.Continue Reading No More Games: Activision Settles with DOJ Over Esports Compensation