| 1969-1971 | Tutor and Teaching Fellow, Harvard University, Massachusetts |
| 1971-1975 | Assistant Professor of History, Hamilton College, New York |
| 1975-1978 | Deputy Director, Aspen Institute Berlin |
| 1982-1984 | Vice President for Academic Affairs, Longwood College, Virginia |
| 1984-1985 | Senior Vice President, International Management and Development Institute, Washington, D.C. |
| 1985-1992 | Director, West European Studies, Woodrow Wilson International Center for Scholars, Washington, D.C. |
| 1990 | Member of the U.S. delegation to the Copenhagen CSCE Conference |
| 1991 | Guest Professor at the Stiftung Wissenschaft und Politik, Ebenhausen |
| 1992-1994 | Chief, European Division, Library of Congress |
| 1994-2005 | Democratic Staff Director for European Affairs, U.S. Senate Foreign Relations Committee and Senior Advisor to U.S. Vice President (then-Senator) Joseph R. Biden, Jr. |
| 1993 | , 2000, 2006 Member of the U.S. delegation to the Wehrkunde Security Conference, Munich |
| 2000 | Speech at Assemblée Nationale, Paris |
| 2004 | Member of the U.S. delegation to the inauguration of Boris Tadic as President of Serbia |
| Speech at Deutscher Bundestag, Berlin |
| 2005 | Speech at NATO Parliamentary Assembly, Copenhagen |
| 2005-2006 | Senior Foreign Policy Advisor and Principal, DLA Piper Rudnick Gray Cary U.S. LLP |
| since 2006 | Senior Fellow, Center for Transatlantic Relations, School of Advanced International Studies, Johns Hopkins University, Washington, D.C. |
| since 2007 | Senior Advisor, McLarty Associates (formerly Kissinger McLarty Associates), Washington, D.C. |
| 2009 | Speech at OSCE Permanent Council, Vienna |
| Head of the U.S. Delegation to the 2009 OSCE Human Dimension Implementation Meeting in Warsaw |
| 2010 | Head of the U.S. Delegation to the OSCE 20th Anniversary Conference in Copenhagen |
