Ogata Kōan

Ogata Kōan (緒方洪庵; August 13 1810 - July 25 1863) was a Japanese physician who lived in the Edo period.

He is well-known for importing Western medical knowledge into Japan during Japan's isolationist era (see Rangaku), and for establishing the Tekijuku (適塾) school that later developed into Osaka University in 1938.

Famous alumni
Alumni of the Tekijuku include Fukuzawa Yukichi, Ōmura Masujirō, Otori Keisuke, Takeda Ayasaburō, and the manga artist Tezuka Osamu's ancestor Tezuka Ryōan.

Books
He was the author of "Byogakutsūron" (病学通論), which was the first book on pathology to be published in Japan.