Yamakawa Kenjirō

Yamakawa Kenjirō
Baron Yamakawa Kenjirō
Born	(1854-09-09)September 9, 1854 Aizu-Wakamatsu, Fukushima, Japan
Died	June 26, 1931(1931-06-26) (aged 76)
Citizenship	Japanese
Fields	Physics
Institutions	Tokyo Imperial University Kyushu Imperial University Kyoto Imperial University
Alma mater	Yale University

Baron Yamakawa Kenjirō (山川 健次郎^?, September 9, 1854 – June 26, 1931) was a Japanese samurai of the late Edo period who went on to become a noted physicist, university president, and author of several histories of the Boshin War. Though his name is commonly written "Yamakawa," he himself wrote it as "Yamagawa" in English.

Yamakawa was born as the third son to Yamakawa Naoe, a senior samurai of the Aizu Domain (present day Fukushima Prefecture). He became a member of the Byakkotai, a unit of the newly reorganized Aizu domain army composed mostly of boys aged 15 to 17 years, who fought in defense of Aizu during the Boshin War.

After the Meiji Restoration, through the mediation of the Zen monk Kawai Zenjun, Yamakawa was placed in the care of Chōshū retainer Okudaira Kensuke. Yamakawa was sent by the new Meiji government to study physics at Yale University, where he was the first student from Japan to graduate. On his return to Japan, he was posted to Tokyo Imperial University working as an assistant and interpreter, and became Japan’s first Japanese professor of physics in 1879. (There had already been several foreign professors, such as Thomas Corwin Mendenhall and William Edward Ayrton.)

During the Meiji and Taishō periods he helped found the Kyushu Institute of Technology in 1907 and served as president of Tokyo Imperial University (1901-1905 and 1913-1920), Kyushu Imperial University (1911-1913), and Kyoto Imperial University (1914-1915). He was later ennobled with the title of danshaku (baron) under the kazoku peerage system. Later in his life he was also a Privy Councilor (appointed in February 1923) and a member of the House of Peers.