- 1995/04 - 現在 Division of Natural Sciences, International Christian University, Professor
- 2013/04 - 2015/03 Associate Dean of College of Liberal Arts (in charge of Student Learning), International Christian University
- 2013/04 - 2015/03 Director, Digital Media Support Center, International Christian University
- 2011/04 - 2013/03 Associate Dean (in charge of Curriculum), College of Liberal Arts, International Christian University
- 2011/09 - 2012/03 Director, Faculty Development, International Christian University
- 1993/10 - 1995/03 Division of Natural Sciences, International Christian University, Associate Professor
- 1990/10 - 1993/09 Department of Mathematical Sciences, Osaka Kyoiku University, Assistant Professor
- 1983/04 - 1990/09 Department of Mathematics, Osaka Kyoiku University, Lecturer
- 1980/10 - 1983/03 Department of Mathematics, Osaka Kyoiku University, Assistant
- International Christian University College of Liberal Arts Division of Arts and Sciences Professor
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