Miron Sher

Miron Naumovich Sher (Russian: Мирон Наумович Шер; June 29, 1952 – August 21, 2020) was an influential Ukrainian-born American chess grandmaster. In 1981, at age 29, Sher became a chess coach for the Russian national team, a role he held until 1985.
Sher became an international master in 1988 and a grandmaster in 1992.
In 1991, when the Soviet Union dissolved, Sher became a Russian citizen. 
Sher died August 21, 2020, in New York City at the age of 68.