- 2005/04 - 現在 Professor, Faculty of Law, Hosei University
- 1997/04/01 - 2005/03/31 Professor, Faculty of Law, Tokyo Metropolitan University
- 1997/04 - 2005/03 Professor, Faculty of Law, Tokyo Metropolitan University
- 1991/04/01 - 1997/03/31 Associate Professor, Faculty of Law, Tokyo Metropolitan University
- 1991/04 - 1997/03 Associate Professor, Faculty of Law, Tokyo Metropolitan University
- 1993/09 - 1995/08 research fellow of Bremen University (Germany)
- 1985/04/01 - 1991/03/31 Associate Professor, Faculty of Human and Natural Sciences, Yokohama City University
- 1985/04 - 1991/03 Associate Professor, Faculty of Human and Natural Sciences, Yokohama City University
- 1983/04 - 1985/03 research assistant, Institute for Social Sciences, The University of Tokyo
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