- Assistant University Tokyo, 1981-1989. Associate professor Kyoto (Japan) University, 1989-1995. Professor Osaka (Japan) University, 1995-1999, University Tokyo, since 1999.
- Author: Netsu Toukeirikigaku, 1993, Netsurigigakuno kiso, 1995, Kaiseki Rikigaku, 2000, Saachi Keisan, 2002, Soatene-Rinanigerisho, 2002, Yugen Ondo nc Butsurigaden, 2004, Ryoushi Spin-kei, 2006. Editor Progress of Theoretical Physics, since 1991, Magazine of Physical Society Japan, 1984-1986, Solid State Communication, since 2005. Contributor articles to professional journals.