- 2015/04 - 現在 キリスト教と文化研究所長
- 2015/04 - 現在 International Christian University Faculty of Liberal Arts, Department of Humanities Professor
- 2006/04 - 現在 International Christian University Board of Trustees, High School Committee Member
- 2014/04 - 2017/03 International Christian University Chair of Religious Affairs Committee
- 2014/04 - 2015/03 Chair, Department of Art, Literature and Music, International Christian University
- 2007/04 - 2015/03 Senior Associate Professor Faculty of Liberal Arts, Division of Senior Associate Professor
- 2012/09 - 2013/03 Chair, Department of Literary Studies, International Christian University
- 2011/09 - 2012/08 University of Oxford St. John's College and Corpus Christi College Visiting Scholar
- 2010/04 - 2011/03 Associate Dean, College of Liberal Arts (in charge of Curriculum), International Christian University
- 2009/09 - 2010/08 Director, Institute for the Study of Christianity and Culture, International Christian University
- 2008/04 - 2010/03 Director, Diffendorfer Memorial Hall, International Christian University
- 2008/04 - 2010/03 Chair, Department of Literary Studies, International Christian University
- 2005/04 - 2007/03 International Christian University Faculty of Liberal Arts, Division of Humanities Associate Professor
- 1997/04 - 2005/03 Tokyo Metropolitan University Faculty of Humanities, Department of Philosophy Associate Professor