Mstislav Keldysh

Mstislav Vsevolodovich Keldysh was a Soviet scientist in the field of mathematics and mechanics, academician of the USSR Academy of Sciences (1946), President of the USSR Academy of Sciences (1961–1975), three times Hero of Socialist Labor, fellow of the Royal Society of Edinburgh (1968). He was one of the key figures behind Soviet space program. Among scientific circles of USSR Keldysh was known with epithet "the Chief Theoretician" in analogy with epithet "the Chief Designer" used for Sergey Korolyov.