Bachelor, University Tokyo, 1953.
Assistant professor University Tokyo, 1953-1958. Lecturer Tokai University, Tokyo, 1958-1959, associate professor, 1959-1963, University Tokyo, 1963-1972, professor, 1972-1990, professor emeritus, since 1990. Professor Obirin University, Tokyo, 1990-2000, professor emeritus, since 2000.
Visiting professor University Vienna, Austria, 1967-1968, University Heidelberg, Germany, 1976-1978. Chairman Graduate School International Relations, University Tokyo, 1979-1981, 85-87. Councilor Graduate School, University Tokyo, 1985-1987.
Director Institute International Studies, Obirin University, 1995-1999.
Member International Association for the Advancement of Hegelian Studies, Japan Association International Relations, Japan Society for Ethics (Watsuji prize 1960).
Married Yuriko Tahara, March 21, 1958.