Marc De Leeuw joined Sullivan & Cromwell in 1994 and has been a partner since 2001. His litigation practice includes representing clients in a variety of areas, including intellectual property, securities, antitrust, real estate, contract, bankruptcy and many other commercial matters. Mr. De Leeuw has represented clients before arbitration tribunals, the International Trade Commission, New York and New Jersey state trial and appellate courts, numerous federal district courts and Courts of Appeals and the U.S. Supreme Court. He has participated in trials and arbitration hearings in intellectual property, antitrust, tort and insurance cases.