- 1989 - 1997 : 大阪教育大学 教授 教授
- 1989 - 1997 : Osaka Kyoiku University, Professor Professor
- 1997 - -: - 金沢大学理工学域 教授 教授
- 1997 - -: - Kanazawa University, Professor
- 1994 - 1995 : 九州大学数理学研究科 流動講座教授 流動講座教授
- 1994 - 1995 : Kyushu University, Visiting Professor Visiting Professor
- 1984 - 1989 : 上越教育大学学校教育学部 助教授 助教授
- 1984 - 1989 : Joetsu University of Education, Associate Professor Associate Professor
- 1986 - 1987 : Ohio State University, Visiting Associate Professor 客員准教授
- 1986 - 1987 : Ohio State University, Visiting Associate Professor Visiting Associate Professor
- 1977 - 1984 : 筑波大学数学系 助手 助手
- 1977 - 1984 : University of Tsukuba, Instructor Instructor
- 1980 - 1981 : Ohio State University, Visiting Assistant Professor 客員助教授
- 1980 - 1981 : Ohio State University, Visiting Assistant Professor Visiting Assistant Professor
- 1978 - 1980 : Royal Holloway College, University of London, British Council Scholar ブリティシュ・カウンシル・スカラー
- 1978 - 1980 : Royal Holloway College, University of London, British Council Scholar British Council Scholar
- 1974 - 1977 : 東京教育大学理学部 助手 助手
- 1974 - 1977 : Tokyo University of Education, Instructor Instructor
- Kanazawa University Institute of Science and Engineering, Faculty of Mathematics and Physics, Institute of Science and Engineering, Faculty of Mathematics and Physics