- 1983 - 1996 Tohoku University
- 1983 - 1996 Tohoku University, Professor
- 1979 - 1983 Tohoku University
- 1979 - 1983 Tohoku University, Assistant Professor
- 1971 - 1979 Hiroshima University
- 1971 - 1979 Hiroshima University, Assistant Professor
- 1971 - 1973 International Institute for Advanced Studies
- 1971 - 1973 Institute for Advanced Study, Member
- 1967 - 1971 Osaka University
- 1967 - 1971 Osaka University, Assistant
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