Hon. Edwin D. Williamson

Of Counsel, Sullivan & Cromwell LLP

Upon his resignation as the Legal Adviser of the U.S. Department of State in January 1993, Mr. Williamson rejoined Sullivan & Cromwell's Washington, D.C. office. He originally joined the Firm in 1964 after graduating from New York University School of Law, where he was an editor of the Law Review. He became a partner of the Firm in 1971, moved to its London office in 1976, returned to its New York office in 1979, moved to its Washington, D.C. office in 1988 and became Of Counsel in 2007.
At Sullivan & Cromwell, Mr. Williamson has engaged in a broad and wide-ranging domestic and international financing and transactions practice, as well as advice with respect to corporate governance issues, the United States’ economic sanctions laws, the ethics rules applicable to government officials and the immunities of foreign sovereigns and international organizations. 
Mr. Williamson is an active participant on panels and other forums involving public international law and national security issues, such as the domestic and international bases for the use of force, the role of the United States with respect to the International Criminal Court, the law of the sea and the application of international legal principles in the war against terrorism.
Mr. Williamson is a member of the Council on Foreign Relations and a former member of the Executive Council of the American Society of International Law, the Executive Committees of the Business and Advisory Committee (BIAC) to the OECD and the U.S. Council for International Business, the United States Advisory Board of NTT DoCoMo, Inc. and the Board of Directors of Triton Oil & Gas Limited.

  • 1964, New York University School of Law, J.D.
  • 1992, University of the South, D.C.L.
  • 1961, University of the South, B.A.

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Publications and Multimedia
OBB Personenverkehr AG v. Sachs - Post-Decision SCOTUScast
SCOTUScast 12-7-15 featuring Edwin Williamson
December 07, 2015
OBB Personenverkehr AG v. Sachs - Post-Argument SCOTUScast
SCOTUScast 11-18-15 featuring Edwin Williamson
November 18, 2015
National Security, the U.N., and the Extraterritorial Application of Treaties - Podcast
International & National Security Law Practice Group Podcast
March 20, 2014
The President's Authority in Libya - Podcast
International & National Security Law Practice Group Podcast
April 07, 2011
DOJ's Ex-Detainee Lawyers: The Ethics Issue
Engage Volume 11, Issue 3, December 2010
December 23, 2010
Preventing Attacks through Interrogation and Transfer of Terrorist Suspects - Event Audio/Video
International & National Security Law Practice Group and the Heritage Foundation
May 28, 2009
Medellin v. Texas - Part I: Self-Execution
Online Debate
March 28, 2008
Medellin v. Texas: Presidential Power and International Tribunals - Event Audio/Video
Co-Sponsored by the American Enterprise Institute
September 27, 2007
Are We Overlawyering International Affairs?
Engage Volume 8, Issue 2
May 03, 2007
Are We Over-Lawyering International Affairs? - Event Audio
2006 National Lawyers Convention
November 18, 2006
Customary International Law: The Next Font of Judicial Activism? - Transcript
2003 National Lawyers Convention - "International Law and American Sovereignty"
November 13, 2003
Separation of Powers and Foreign Policy
Federalism & Separation of Powers Practice Group Newsletter - Volume 3, Issue 3, Winter 2000
March 01, 2000
Protecting Everyone's Right to Property
International & National Security Law Practice Group Newsletter - Volume 1, Issue 3, Fall 1997
December 01, 1997
Investment Agreement Negotiations in the OECD
International & National Security Law Practice Group Newsletter - Volume 1, Issue 1, Fall 1996
December 01, 1996