Mstislav Keldysh was a Soviet mathematician known as the 'Chief Theoretician' of the Soviet space program, a title reflecting his role directing the scientific and theoretical foundations of Soviet spaceflight while working alongside chief designer Sergei Korolev, though his identity, like Korolev's, was kept secret from the public during his lifetime. A specialist in applied mathematics, aerodynamics and mechanics, he made foundational contributions to the theory of rocket trajectory calculation and to Soviet work on aircraft flutter before turning his mathematical expertise to orbital mechanics and space mission planning in the late 1950s. He served as president of the Soviet Academy of Sciences from 1961 to 1975, one of the longest tenures in that role, during which he oversaw Soviet planning for uncrewed lunar and planetary exploration alongside the crewed program, and he was honored as a Hero of Socialist Labor three separate times, the country's highest civilian honor.
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