Marc De Leeuw has been a partner at Sullivan & Cromwell 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, contract, and insurance cases.
His recent intellectual property matters include representing Ocado in multiple patent litigation cases against AutoStore, AB InBev and Modelo in trademark infringement and contract actions, and a group of 15 major universities in a joint patent licensing program called University Technology Licensing Program (UTLP). He has also obtained dismissals in securities litigation for Abiomed, Ally Financial, and BP.
Mr. De Leeuw has been recognized many times as a New York Super Lawyer and as a “Future Star” by Benchmark Litigation. He has been named multiple times in the AmLaw “Litigator of the Week,” and by the National Law Journal for his successful representation of Microsoft in a major antitrust jury trial.
For more information, visit: www.sullcrom.com/lawyers/Marc-DeLeeuw
Updated Aug 2023
