Marc De Leeuw joined Sullivan & Cromwell LLP in 1994 and has been a partner since 2001. His litigation practice includes representing clients in a variety of areas, including on securities, intellectual property, antitrust, real estate, contract, insurance and many other commercial matters.
Marc has represented clients before arbitration tribunals, 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 a variety of cases.
Among the securities matters he has handled include:
- Represents BP in multiple securities, shareholder derivative and ERISA actions arising out of the Gulf of Mexico oil spill, including in obtaining dismissal of the federal shareholder derivative action on the ground of forum non conveniens.
- Represents Barclays in nationwide Enron litigation, including a securities class action and related proceedings and obtaining reversal of the district court's decision to certify a class of Enron shareholders to pursue securities claims against Barclays and others seeking $40 billion in damages.
- Represents various mutual funds and their directors in investigations and civil actions concerning board decisions and fund practices.
- Represented Cablevision in shareholder derivative and class actions concerning options "backdating" and "going private" offers.
Marc serves on the Board of Directors of MFY Legal Services, has represented a host of pro bono clients, and has been a speaker at conferences involving securities, investment company and patent litigation.