- 2009/04 - 現在 Professor, Department of Philosophy and Religion, International Christian University
- 2023/04 - 2026/03 International Christian University College of Liberal Arts Division of Arts and Sciences Professor
- 2017/04/01 - 2019/03/31 Library
- 2017/04 - 2019/03 International Christian University Library Other
- 2014/04 - 2016/03 College of Liberal Arts Peace Studies Major Major Coordinator
- 2014/04 - 2016/03 College of Liberal Arts Peace Studies Major Major Coordinator
- 2012/04 - 2015/03 Director, The Institute for the Study of Christianity and Culture, International Christian University
- 2011/04 - 2013/03 Associate Dean (in charge of Student Learning), College of Liberal Arts, International Christian University
- 2009/09 - 2012/03 Chair, Dept. of Philosophy and Religion, International Christian University
- 2004/08 - 2009/03 University of West Georgia
- 2003/09 - 2004/05 Gonzaga University
- 2001/09 - 2003/06 Santa Clara University
- 1996/04 - 2001/05 Sophia University
- Graduate School, School of Arts and Sciences Master's Course, Comparative Culture Program Professor
- Division of Arts and Sciences, College of Liberal Arts Professor
- Division of Arts and Sciences, College of Liberal Arts ID Majors Peace Studies Major Coordinator
- Graduate School, School of Arts and Sciences Master's Course, Comparative Culture Program Professor
- Division of Arts and Sciences, College of Liberal Arts Professor
- Division of Arts and Sciences, College of Liberal Arts ID Majors Peace Studies Major Coordinator