- 1975 - 1987 Dokkyo University Faculty of Law
- 1975 - 1987 Faculty of Law, Dokkyo University, Professor
- 1987 - - 東海大学政治経済学部 教授
- 1987 - - 獨協大学 名誉教授
- 1987 - - School of Political Science and Economics, Tokai University, Professor
- 1987 - - Dokkyo University, Professor Emeritus
- 1970 - 1975 Dokkyo University Faculty of Law
- 1970 - 1975 Faculty of Law, Dokkyo University, Associate Professor
- 1966 - 1970 Dokkyo University Faculty of Law
- 1966 - 1970 Faculty of Law, Dokkyo University, Lecturer
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