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Greg is a partner in the firm’s Antitrust & Competition practice group and a nationally recognized trial lawyer in complex business litigation. In the leadership of the American Bar Association Antitrust Section, he has most recently served as Co-Chair of the Monopolization and Dominance Committee. He has won victories for defendants and plaintiffs in some of Maine's largest cases and maintains a national and international litigation practice. He frequently advises overseas clients on U.S. legal matters. He is listed in Woodward/White's The Best Lawyers in America, which named him 2017 and 2015 "Lawyer of the Year" for Mass Tort Litigation/Class Actions - Defendants. He currently serves as court-appointed co-lead counsel for direct purchasers in In re Automotive Parts Antitrust Litigation, MDL 2311, with over $300 million in settlements. In 2026, he was appointed as interim co-lead counsel for direct purchasers in In re Fire Apparatus Antitrust Litigation, MDL 3179. In other cases, he won a $19 million jury verdict as lead trial counsel in Missouri federal court in an international contract dispute, recognized in the National Law Journal as one of Top 100 Verdicts of the year; recovered $32 million for a class of direct purchasers of marine hose in federal antitrust litigation in Miami; and brought an antiterrorism case on behalf of American missionaries murdered in Colombia. He has argued six times before the U.S. Judicial Panel on Multidistrict Litigation. Greg is experienced in class actions, antitrust & trade regulation, international, securities, construction, corporate, intellectual property, products liability, mass torts, contract, fraud, healthcare, RICO, employment, real estate, land use, technology, lender liability, professional malpractice, personal injury, wrongful death, food & drug regulation and labeling, fidelity & surety, insurance, arbitration and mediation.