1989 – 1997
Director, Center for European Community Studies, George Mason University

1993-1994 academic year, Adviser, Directorate General for Education, Communication, and Culture, European Commission, Brussels
Research Fellow, College of Europe, Bruges, Belgium

1997-2000 academic years
Professor, College of Europe, Bruges, Belgium
Fellow, Netherlands Institute for International Relations, Clingendael, The Hague, The Netherlands

Present
Professor Jean Monnet Chair in European Public Policy
Director, International Commerce and Policy Program, School of Public Policy, George Mason University