- 1980 - 1989 Yamagata University
- 1980 - 1989 Yamagata University, Assistant Professor
- 1989 - - 山形大学 教授
- 1989 - - Yamagata University, Professor
- 1976 - 1980 Yamagata University
- 1976 - 1980 Yamagata University, Lecturer
- 1971 - 1976 Yamagata University
- 1971 - 1976 Yamagata University, Assistant
- Yamagata University Faculty of Science, Department of Mathematical Sciences
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