Mstislav Keldysh

Soviet mathematician and physicist (1911-1978).

Born February 10th, 1911 in Riga. [ref]

Died June 24th, 1978 at 67 years old in Moscow (heart failure).

Occupations
engineer, mathematician, physicist, politician, university teacher
Wikipedia

What we have once enjoyed deeply we can never lose. All that we love deeply becomes a part of us. Helen Keller