- 2003 - - 早稲田大学 教授
- 2003 - - Waseda University, Professor
- 1996 - 2002 東京大学大学院 教授
- 1996 - 2002 Tokyo University, Graduate School, Professor
- 1985 - 1995 The University of Tokyo
- 1985 - 1995 Tokyo University, Professor
- 1984 - 1985 The University of Tokyo
- 1984 - 1985 Tokyo University, Assistant Professor
- 1974 - 1983 Shinshu University
- 1974 - 1983 Shinshu University, Assistant Professor
- 1972 - 1973 Shinshu University
- 1972 - 1973 Shinshu University, Lecturer
- Waseda University Faculty of Law Professor
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