| Nishimura and Sanada (1989-1990) |
| TMI Associates (Associate, 1990-1999; Partner, 1999-Present) |
| Lecturer at Chuo University, Faculty of Law (1996-2007) |
| Lecturer at Keio Law School (2004-Present) |
| Professor at Research Institute for Digital Media and Content, Keio University
(February 2005-2007) |
| Lecturer at Waseda University School of Sport Sciences(2006-2007) |
| Lecturer at Waseda University Graduate School of Sport Sciences (2006-Present) |