| Ministry of Education (1977-1979) |
| Assistant Professor, Nihon University (1986-1988) |
| Associate Professor, Hiroshima University (1988-1991) |
| Professor, Hosei University (1991-Present) |
| National Bar Examination Committee (2000-Present) |
| TMI Associates (Special Counsel, 2004-Present) |
| Dean, Faculty of Law, Hosei University (2005-2007) |