- 2024/04 - 現在 Rikkyo University
- 2023/04 - 現在 Takushoku University Institute of World Studies Professor
- 2020/04 - 2023/03 National Institute for Defense Studies Regional Studies Department Director / Professor
- 2008/04 - 2023/03 Graduate School of TAKUSHOKU University International Security Studies Course Guest Professor
- 2017/04 - 2021/09 Rikkyo University Part-time lecturer
- 2017/04 - 2020/03 National Institute for Defense Studies, Ministry of Defense, Japan Regional Studies Department Head, China Division
- 2017/03 - 2017/04 Royal United Services Institute for Defence and Security Studies: RUSI Visiting Fellow
- 2016/04 - 2017/03 National Institute for Defense Studies, Ministry of Defense, Japan China Division, Regional Studies Department Senior Research Fellow/ Professor
- 2012/04 - 2016/03 National Institute for Defense Studies, Ministry of Defense,Japan Northeast Division, Regional Studies Department Senior Research Fellow/ Professor
- 2001/04 - 2012/03 Ministry of Education, Culture, Sports, Science and Technology, Japan Elementary and Secondary Education Bureau Senior Textbook Analyst
- 2005/04 - 2011/03 MEIJI University School of Political Science and Economics Lecturer (part-time)
- 2008/04 - 2008/09 SENSHU University Faculty of Law Lecturer (part-time)
- 2006/04 - 2007/03 OTSUMA Women's University Faculty of Language and Literature Lecturer (part-time)
- 2002/04 - 2005/09 J. F. Oberlin University Faculty of International Studies Lecturer (part-time)
- 2000/10 - 2001/03 Embassy of Japan in China political department Research Fellow
- 1997/08 - 2000/08 Interchange Association, Japan Taipei Office Research Fellow
- 1997/04 - 1997/07 The KAZANKAI Foundation Guest Resaerch Fellow
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JAPAN ASSOCIATION FOR INTERNATIONAL SECURITY
, THE JAPAN ASSOCIATION OF INTERNATIONAL RELATIONS
, アジア政経学会
, The Japan Association for Taiwan Studies
, The Military History Society of Japan
, The Japan Association for Modern China Studies