Lloyd Constantine

Lloyd Constantine is the Counsel of Constantine Cannon LLP, specializing in antitrust litigation and counseling. Lloyd founded the firm, originally called Constantine & Partners, focusing on antitrust, and was its Chairman and Managing Partner until January 2007.

Constantine is one of the nation’s leading authorities on antitrust law and litigation and competition policy. He was the lead counsel for the plaintiffs in the landmark Visa Check/MasterMoney Antitrust Litigation, which resulted in a $3.4 billion monetary settlement and a historic injunction, which the court valued as providing upwards of $87 billion in benefit for U.S. merchants and consumers. Constantine has litigated at all levels of federal and state courts, including oral argument before the United States Supreme Court. He was lead or co-lead counsel in many complex private antitrust and multiple state actions, including the Panasonic Antitrust Litigation (49 States); Liberty Cable v. Time Warner; the Minolta Antitrust Litigation (37 States); Kesmai v. AOL; States v. Visa and MasterCard (15 States); States v. Mitsubishi (50 States); Primestar I (44 States); Discover v. Visa and MasterCard; and Ortho Biotech v. Amgen. Constantine has frequently testified before Congress on antitrust, international trade and nominations to the United States Supreme Court. He has also served as an expert on U.S. competition law and economics in Australian and Canadian antitrust cases and as consultant on antitrust law to a federal district court in Hatch-Waxman litigation.