Bunsaku Arakatsu (荒勝文策; あらかつ ぶんさく, 25 March 1890 – 25 June 1973) was a Japanese physics professor in the World War II Japanese Atomic Energy Research Program of the Imperial Japanese Navy. Arakatsu was a former student of Albert Einstein.
Source: “Bunsaku Arakatsu”, English Wikipedia (CC BY-SA 4.0), excerpt