- 1978
- The University of Tokyo (LL.B.)
- 1978 - 1981
- Research Associate, Faculty of Law, The University of Tokyo
- 1981 - 1991
- Associate Professor, Faculty of Law, The University of Tokyo
- 1983 - 1984
- Visiting Researcher, Harvard Law School (Fellow of Overseas Research Fellowships, Japan Society for the Promotion of Science)
- 1984 - 1985
- Visiting Researcher, University of California, Berkeley (Fellow of Overseas Research Fellowships, Japan Society for the Promotion of Science)
- 1990 - 1991
- Visiting Professor, Harvard Law School
- 1991 - 1994
- Associate Professor, University of Tokyo Graduate Schools for Law and Politics/Faculty of Law
- 1994 - 2019
- Professor, University of Tokyo, Graduate Schools for Law and Politics/Faculty of Law
- 1998
- Visiting Researcher, Georgetown University Law Center
- 2001 - 2009
- Principal Lecturer/Visiting Professor, Open University of Japan,School of Graduate Studies
- 2004 - 2019
- Professor, University of Tokyo, Graduate School of Public Policy (concurrent)
- 2019 - present
- Professor Emeritus, The University of Tokyo
- 2019 - 2025
- Justice of the Supreme Court of Japan
- 2025 - present
- Special Advisor, Nagashima Ohno & Tsunematsu
