Assistant professor Institute for Political Science University Tübingen, 1989-1993. Professor political science and international relations University Bremen, since 1993, co-director Institute for Intercultural and International Studies, since 1995, co-director Center for European Law and Policy, 1996-1900. Visiting professor Graduate School International Studies University Denver, 1991.
Thyssen research fellow Center for International Affairs Harvard University, 1992-1993. Research associate International Institute for Applied Systems Analysis, Laxenburg, Austria, 1993-1996, Center for Advanced Studies, Oslo, Norway, 1999.
1989 - 1993
1996 - 1996