- 2000 - 2010 University of Tokyo, Graduate School of Arts and Sciences Adjunct Professor of European Studies, University of Tokyo
- 1989 - 2000 University of Tsukuba History of International Relations Associate Professor
- 2000 - University of Tsukuba r of the History of International Relations Full Professo
- 1985 - 1989 University of Stuttgart Associate Professor in Medieval and Modern History and Histrical Behaviour Studies
- 1980 - 1985 University of Stuttgart Assistant (Professor) in history
- 1978 - 1980 Academic librarian Prussian State Library, Berlin
- 1972 - 1975 Chair of Reinhard Wenskus University of Goettingen Teaching Assistant in medieval history
- University of Tsukuba Faculty of Humanities and Social Sciences Professor
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