- 1979 - 1988 Yamagata University
- 1979 - 1988 Yamagata University, Associate Professor
- 1988 - - 山形大学 教授
- 1988 - - Yamagata University, Professor
- 1972 - 1979 Yamagata University
- 1972 - 1979 Yamagata University, Lecturer
- 1966 - 1972 Yamagata University
- 1966 - 1972 Yamagata University, Research Assistant
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