- 1989 - 2000 Yokohama National University
- 1989 - 2000 Yokohama National University, Professor
- 1969 - 1989 Yokohama National University
- 1969 - 1989 Yokohama National University, Assistant
- 1966 - 1969 Yokohama National University
- 1966 - 1969 Yokohama National University, Lecturer
- 1962 - 1964 新潟県東頚城郡松之山町立松之山中 教諭
- 1962 - 1964 Matsunoyama Junior High School, Niigata,
- 1960 - 1962 新潟県西頚城郡青海町立中学校 教諭
- 1960 - 1962 Ohmi Junior High School, Niigata, teacher
- Professor
- teacher
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