- 2000/04 - 2019/03 Sophia University Faculty of Foreign Studies, Department of Russian Studies Professor
- 2016/04 - 2017/03 Keio University Faculty of Law
- 1992/10 - 2017/03 Hokkaido University
- 2013/10 - 2014/03 The University of Tokyo Faculty of Law
- 2010/04 - 2012/03 Hokkaido University
- 2009/04 - 2011/03 Sophia University Dean of the Faculty of Foreign Studies
- 2001/04 - 2009/03 財団法人国際情勢研究会 非常勤研究員
- 2006/10/01 - 2007/03/31 Tokyo Metropolitan University Lecturer
- 2005/04/01 - 2007/03/31 Slavic Research Center, Hokkaido University Visiting Reserch Fellow
- 2006/04 - 2007/03 The University of Tokyo Lecturer
- 2005/10/01 - 2006/03/31 Tokyo Metropolitan University Lecturer
- 2004/10/01 - 2005/03/31 Tokyo Metropolitan University Lecturer
- 2003/10/01 - 2004/03/31 Tokyo Metropolitan University Lecturer
- 2002/10/01 - 2003/03/31 Tokyo Metropolitan University Lecturer
- 2000/04 - 2003/03 財団法人日本国際問題研究所 客員研究員
- 2000/04 - 2000/09 Tokyo Metropolitan University
- 1999/04/01 - 2000/03/31 Kyushu University Visiting Professor
- 1999/04 - 2000/03 財団法人国際情勢研究会 非常勤研究員
- 1999/04 - 2000/03 Seinan Gakuin University
- 1993/04 - 2000/03 Sophia University Lecturer
- 1993/04 - 2000/03 Center for Russian Studies, The Japan Institute of International Affairs Senior Research Fellow
- 1999/09 - 1999/12 Keio University
- 1999/04 - 1999/09 Tokyo Metropolitan University
- 1998/10 - 1999/03 Tokyo Metropolitan University
- 1997/10 - 1998/03 Tokyo Metropolitan University
- 1996/10 - 1997/03 Tokyo Metropolitan University
- 1995/10 - 1996/03 Tokyo Metropolitan University Lecturer
- 1994/10 - 1995/03 Tokyo Metropolitan University Lecturer
- 1993/04 - 1993/09 Tokyo Metropolitan University Lecturer
- 1992/04 - 1993/03 財団法人日本国際問題研究所 ロシア研究センター 研究員
- 1990/07 - 1992/03 防衛庁 防衛研究所 所員
- 1990/03/31 - 1992/02/28 Embassy of Japan in the USSR Attache
- 1989/04 - 1990/06 Keio University Lecturer
- 1986/04 - 1990/03 The National Institute for Defense Studies Assistant Professor
- 1978/04 - 1983/03 Keio University Faculty of Law Teaching Assistant
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