| 1955 |
LLB at the University of Tokyo, Faculty of Law |
| 1957 |
LL.M at Masters Course, Tokyo University Post Graduate Sociology,
Entered the Legal Training and Research Institute (11th graduating class) |
| 1959-1972 |
| |
Senior Lecturer, Associate Professor of Rikkyo University, Law Faculty, Associate Professor of Hitotsubashi University |
| 1963 |
LL.D at Tokyo University, Doctors Course, Post Graduate Sociology |
| 1965-1967 |
| |
Study in the former West Germany as a research scholar of the Alexander von Humboldt Foundation |
| 1972-1996 |
| |
Professor of Hitotsubashi University |
1996
|
Emeritus professor of Hitotsubashi University
Professor of Surugadai University, Law Faculty |
| 1997 |
Admitted to the bar (Daiichi Tokyo Bar Association)
Special Counsel of Abe, Ikubo & Katayama |
| 1999 |
President of Surugadai University |
| 2007 |
Chancellor of Surugadai University |