- Assistant librarian Waseda University Library, 1961-1968, librarian and lecturer Russian, 1967-1979, research librarian Russian language and history, 1981-1986. Special research Staff Institute Social Science, 1981-1986.
- Author: Japan and Russia: A History of Relations from 17th to 19th Centuries, 1971. Contributing author British International Encyclopedia, Japanese edition, 1977, Dictionary of Diplomatic History of Japan, 1979, Holp's World Biographical Dictionary, 1978-1981, Biographical Dictionary of Meiji Restoration, 1981, Grand Dictionary of History of Japan, 1979-1986. Also articles.