- 1991 - 2003 Kanagawa University Faculty of Law
- 1991 - 2003 Professor, Faculty of Law, Kanagawa Univ.
- 1986 - 1991 The University of Tokyo Institute of Social Science
- 1986 - 1991 Professor, Institute of Social Science, Univ. of Tokyo
- 1981 - 1986 Chiba University Faculty of Law and Economics
- 1981 - 1986 Professor, Faculty of Law and Economics, Chiba University
- 1960 - 1981 Tohoku University Faculty of Law
- 1960 - 1981 professor, Faculty of Law, Tohoku University
- 1955 - 1960 The University of Tokyo Institute of Social Science
- 1955 - 1960 research assistant, Institute of Social Science, University
- of Tokyo
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