Adjunct Professor, Georgetown Law Center
Director of Legal Affairs, O.E.C.D., Paris, January 1998 - May 2005
Deputy Director of Legal Affairs, O.E.C.D., October 1989 - December 1997
Assistant Legal Adviser, US Department of State, May 1976 -September 1989
Attorney Adviser, US Department of State, June 1966 - April 1976