| 1971/3 | The University of Tokyo, Graduate School, Law and Politics, Juris Dr. | |
| 1973/6 | Harvard Law School, LL.M. | |
| 1971/4 | Associate Professor of Law, St.Paul’s University | |
| 1975/6 | Nagashima & Ohno Law Office (-1977/11) | |
| 1979/4 | Professor of Law, St.Paul’s University | |
| 1993/4 | Professor of Law, Hokkaido University | |
| 1993/10 | Visiting Professor of Law, The University of Tokyo (-1997/3) | |
| 1997/4 | Professor of Law, Chuo University (-2007/3) | |
| 2007/6 | Admitted to The Dai-Ichi Tokyo Bar Association | |
| 2008/3 | Of Counsel, Masuda & Partners Law Office (-Up to the Present) |
| ● | International Commercial Transactions U.S., EU, ASEAN & Alien Affairs |
| ● | Contracts, Torts, Property, Trusts & Succession, Domestic Relations(for the socially weak minority) |
| ● | Corporations(Financial Services ・ Succession of Business ・ Labor Relations) |
| ● | “Theories on Anglo-American Law of Contracts”(University of Tokyo Press, 1977) |
| ● | “American Constitutional Law Today” (Collaborated with Prof.T.I.Emerson, YLS) (University of Tokyo Press, 1978) |
| ● | “Private Law in the United States”(Yuhikaku, 1988) |
| ● | “Public Law in the United States” (Yuhikaku, 1993) |
| ● | “A General View of the Legal System of the United States” (Yuhikaku, 2000) |
| 1992 | Representative Director, Japanese American Society for Legal Studies (-1998) |
|
| 1997 | Member, Disciplinary Committee, Tokyo Bar Association (-1998) |
