- 2000/04 - 2019/03 Sophia University Department of Russian Studies, Faculty of Foreign Studies Professor
- 2016/04 - 2017/03 Keio University Faculty of Law Lecturer
- 1992/10 - 2017/03 Hokkaido University Slavic-Eurasian Research Center Visiting Reserch Fellow
- 2013/10 - 2014/03 The University of Tokyo Faculty of Law
- 2009/04 - 2011/03 Sophia University Faculty of Foreign Studies Dean of the Faculty of Foreign Studies
- 2001/04 - 2008/03 財団法人 国際情勢研究会 非常勤研究員
- 2006/10 - 2007/03 Tokyo Metropolitan University Lecturer
- 2006/04 - 2007/03 The University of Tokyo Lecturer
- 2005/10 - 2006/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 2004/10 - 2005/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 2003/10 - 2004/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 2002/10 - 2003/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 2000/04 - 2003/03 The Japan Institute of International Affairs Visiting Research Fellow
- 2001/10 - 2002/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 2000/04 - 2000/09 Tokyo Metropolitan University Faculty of Law Lecturer
- 1999/04 - 2000/03 社団法人 国際情勢研究会 非常勤研究員
- 1999/04 - 2000/03 Seinan Gakuin University Faculty of Law Lecturer
- 1999/04 - 2000/03 Kyushu University Graduate School of Law Visiting Professor
- 1993/04 - 2000/03 Sophia University Faculty of Foreign Studies Lecturer
- 1993/04 - 2000/03 The Japan Institute of International Affairs Center for Russian Studies Senior Research Fellow
- 1999/09 - 1999/12 Keio University Correspondence Courses Lecturer
- 1998/10 - 1999/09 Tokyo Metropolitan University Faculty of Law Lecturer
- 1997/10 - 1998/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 1997/09 - 1998/03 社団法人 国際情勢研究会 非常勤研究員
- 1996/10 - 1997/03 Tokyo Metropolitan University Faculty of Law
- 1995/10 - 1996/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 1994/10 - 1995/03 Tokyo Metropolitan University Faculty of Law Lecturer
- 1993/04 - 1993/09 Tokyo Metropolitan University Faculty of Law Lecturer
- 1992/04 - 1993/03 The Japan Institute of International Affairs Center for Russian Studies Research Fellow
- 1990/07 - 1992/03 The Japan Defence Agency The National Institute of Defence Studies Associate Professor
- 1990/03 - 1992/02 Embassy of Japan in the USSR Attache
- 1986/04 - 1990/07 The Japan Defense Agency The National Institute for Defense Studies Assistant Professor
- 1989/04 - 1990/03 Keio University Faculty of Law Lecturer
- 1978/04 - 1983/03 Keio University Faculty of Law Teaching Assistant
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