- 1971 - 1999 Sophia University
- 1971 - 1999 Sophia University, Professor
- 1999 - - 創価大学 教授
- 1990 - - Soka University, Professor
- 1964 - 1971 The University of Tokyo
- 1964 - 1971 University of Tokyo, Assistant Professor
- 1960 - 1964 The University of Tokyo
- 1960 - 1964 University of Tokyo, Lecturer
- 1955 - 1960 The University of Tokyo
- 1955 - 1960 University of Tokyo, Research Assistant
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