Yoshihide Kozai

Yoshihide Kozai (1 April 1928 – 5 February 2018) was a Japanese astronomer specialising in celestial mechanics. He is best known for discovering, simultaneously with Michael Lidov, the Kozai mechanism, for which he received the Imperial Prize of the Japan Academy in 1979. He was the first Japanese president of the International Astronomical Union from 1988 to 1991, and was director of the National Astronomical Observatory of Japan from 1988 to 1994. He was professor emeritus at the University of Tokyo, National Astronomical Observatory of Japan and The Graduate University for Advanced Studies. Provided by Wikipedia