- 2004/04 - 現在 Professor
- 2012/04 - 2020/03 President, International Christian University
- 2013/04 - 2017/03 GLS Director, International Christian University
- 2008/04 - 2012/03 Vice President for Academic Affairs, International Christian University
- 2008/04 - 2012/03 Director, Hachiro Yuasa Memorial Museum, International Christian University
- 2008/04 - 2012/03 Director, Integrated Learning Center, International Christian University
- 2006/05 - 2012/03 Director, Academic Reform, International Christian University
- 2011/04 - 2011/09 Director, Peace Research Institute, International Christian University
- 2005/04 - 2006/05 Chair, Division of Languages, International Christian University
- 2004/04 - 2005/03 Director, Japanese Language Programs, International Christian University
- 2002/04 - 2004/03 Associate Professor
- 1992/04 - 2002/03 Associate Professor
- 1995/09 - 1995/11 Dartmouth College Program in Asian Studies Visiting Associate Professor
- 1987/04 - 1992/03 International Center, Keio University Lecturer