Mark Krasnosel'skii, Russian-Ukrainian mathematician and academic (b. 1920)
Mark Alexandrovich Krasnoselsky (Russian: Ма́рк Алекса́ндрович Красносе́льский) (April 27, 1920, Starokostiantyniv – February 13, 1997, Moscow) was a Soviet, Russian and Ukrainian mathematician renowned for his work on nonlinear functional analysis and its applications.