-United States Permanent Representative to the United Nations, United States Mission to the United Nations, 2005-2006
-Under Secretary of State for Arms Control and International Security, Department of State, 2001-2005
-Senior Vice President, American Enterprise Institute, 1999-2001
-Attorney, Lerner, Reed, Bolton & McManus, 1993-1999
-Assistant Secretary for International Organization Affairs, Department of State, 1989-1993
-Assistant Attorney General, Department of Justice, 1985-1989
-Attorney, Covington & Burling, 1983-1985
-Assistant Administrator for Program and Policy Coordination, U.S. Agency for International Development, 1982-1983
-General Counsel, U.S. Agency for International Development, 1981-1982
-Attorney, Covington & Burling, 1974-1981
J.D., Yale University Law School
B.A., Yale University