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.
*****
A person listed as a contributor has spoken or otherwise participated in Federalist Society events, publications, or multimedia presentations. A person's appearance on this list does not imply any other endorsement or relationship between the person and the Federalist Society. In most cases, the biographical information on a person's "contributor" page is provided directly by the person, and the Federalist Society does not edit or otherwise endorse that information. The Federalist Society takes no position on particular legal or public policy issues. All expressions of opinion by a contributor are those of the contributor.
Treaties and National Sovereignty Conference
Faculty Division and the George Washington Student Chapter
The George Washington University Law School2000 H Street N.W.
Washington, DC 20052
The International Criminal Court After Kampala: Should the United States Change its Relationship with the ICC?
National Press Club First Amendment Lounge 529 14th Street, NWWashington, District of Columbia
Panel 2: Preventing Attacks through Interrogation and Transfer of Terrorists Suspects
Counterterrorism and the Obama Administration
The Capitol Visitor CenterFirst St NE
Washington, DC 20515
Courthouse Steps Oral Argument: Jam v. International Finance Corp.
The issue at hand in Jam v. International Finance Corp. is whether the International Organizations...
OBB Personenverkehr AG v. Sachs - Post-Decision SCOTUScast
SCOTUScast 12-7-15 featuring Edwin Williamson
On December 1, 2015, the Supreme Court decided OBB Personenverkehr AG v. Sachs. This case...
OBB Personenverkehr AG v. Sachs - Post-Argument SCOTUScast
SCOTUScast 11-18-15 featuring Edwin Williamson
On October 5, 2015, the Supreme Court heard oral argument in OBB Personenverkehr AG v. Sachs....
National Security, the U.N., and the Extraterritorial Application of Treaties - Podcast
International & National Security Law Practice Group Podcast
The United States Government has consistently interpreted the International Covenant on Civil and Political Rights...
The President's Authority in Libya
International & National Security Law Practice Group Podcast
As the country, and Congress, continues to debate the President's authority for action in Libya,...