- 1975
- The University of Tokyo (LL.B.)
- 1975 - 1979
- Research Associate, Faculty of Law, The University of Tokyo
- 1979 - 1990
- Associate Professor, Faculty of Law, The University of Tokyo
- 1990 - present
- Sir Ernest Satow Professor of Japanese Law, University of London (UCL)
- 1987
- The University of Tokyo (LL.D.)
- 1988 - 1998
- Visiting Professor, Cornell Law School
- 1998 - 2013
- Professor, College d'Europe, Brugge
- 1999 - present
- Visiting Fellow, Max Planck Institute of Foreign and International Private Law
- 1996 - 2013
- Consultant, Herbert Smith LLP, London (currently Herbert Smith Freehills LLP)
- 2007 - present
- Associé, International Academy of Comparative Law
- 2008 - 2018
- Visiting Professor, University of Vienna
- 2009 - 2013
- Advisor, Nagashima Ohno & Tsunematsu
- 2012
- Awarded the Order of Friendship from Russia
- 2013 - 2016
- Counsel, White & Case LLP, London
- 2015 - present
- Member of the Panel of Arbitrators, International Centre for Settlement of Investment Disputes (ICSID)
- 2016 - present
- Special Advisor, Nagashima Ohno & Tsunematsu
- 2017 - 2021
- Professor, School of Law, Waseda University