- 1997 - 2003 Toyo University Faculty of Literature, Department of Indian Philosophy
- 1997 - 2003 Professor, Department of Indian Philosophy,
- 1992 - 2003 The Open University of Japan
- 1992 - 2003 Guest Professor, Hōsō Daigaku (the Japanese
- 2000 - 2002 Toyo University
- 2000 - - Director, Institute for Asian Studies, Toyo University
- 1986 - 1997 University of Tsukuba Institute of Philosophy
- 1986 - 1997 Progessor, Institute of Philosophy, the University
- 1995 - University of Oxford
- 1995 - Visiting Lecture, Balliol College, Oxford University
- 1975 - 1986 University of Tsukuba Institute of Philosophy
- 1975 - 1986 Assoviate Professor, Institute of Philosophy,
- 1964 - 1969 東京大学文学部助手(インド哲学仏教学研究に従事)
- 1964 - 1969 Research Associate, Depertment of Indian and
- 1966 - 1967 ニューヨーク州立大学バッファロー校哲学科専任講師
- 1966 - 1967 Fulbright Visiting Lecturer, Faculty of Philosophy,
- (東洋学研究)
- (フルブライト交換教授)
- Oriental Studies
- Tōhō University
- University of Broadcasting)
- of Tsukuba, Tsukuba
- the University of Tsukuba, Tsukuba
- the State University of New York at Buffalo U. S. A.
- of Tokyo
- Buddhist Philosophy, Faculty of Letters, University