1966 The University of Tokyo (LL.B)
1974 The University of Tokyo (SJD)
1971-1974 Junior Associate Professor at Gakushuin University, Faculty of Law
1974-1979 Associate Professor at Gakushuin Univerity, Faculty of Law
1979-2004, Professor at Gakushuin University, Faculty of Law
2004-2007 Professor at Gakushuin University, School of Law

Family Law; Corporate (transactions); Copyright and Computer Law

Board Member of International Nuclear Law Association (Association Internationale du droit Nucleaire) (2005-current)
Chairperson of the Board of the Copyright Law Association of Japan (2006-current)
Chairperson of the Board of Law and Computer Association of Japan (2001-current)
Chairperson of the Board of Japan Energy Law Institute (2014-current)
Chairperson of the Board of Consumer Education Promotion Council (2013-current)
Chairperson of the Board of Software Information Center (2007-current)

Chairperson of the Board of Computer Information Center (2017-current）
The Chairperson of the Board of Japan Society of Comparative Law (2010-2014)
Chairperson of Legislative Council of the Ministry of Justice (2007-2013)
Chairperson of the Subdivison on Copyright of Council for Cultural Affairs (previously Copyright Council) (1985-2012)
Executive Member of the Board of Gakushuin University (1997-2010)
Scholar in Residence, Paris 12 Val de Marne University (1987, 1989, 1994, 1997 and 2002)

" Legal Parent-Child Relationship of a child who is born by the assisted reproductive technology −− Development of discussion in Japan" (in "the Economic Society and Role of Law" Shojihomu, 2013)
"Japan's nuclear liability system. in Japan's Compensation System for Nuclear Damage" (in English, joint authorship, OECD, NEA 2012)
（2012/04/25）
"Introduction to Private Law, Revised 5th ed." (Yuhikaku, 2012)
"The Mechanism of Compensation of Nuclear Damage and the Fukushima Daiichi Nuclear Power Plant Accident" in Journal "Jurist" No.1427 (2011)
"The Consumer Protection o the Electronic Money and Payment" in JOURNAL OF THE LAW AND COMPUTERS ASSOCIATION OF JAPAN No.27 (2009)
"Civil Law II: Real Rights. 2nd ed." (Yuhikaku, 2009)
"Civil Law I: Introduction, General Provisions. 3rd ed." (Yuhikaku, 2013)
"The Principle of the Freedom of Will and the Interpretation of Will" (Editor and Co-author, Shojihomu, 2008)

International Nuclear Law Association
Copyright Law Association of Japan
Law and Computer Association of Japan