Theodosius Grygorovych Dobzhansky (Ukrainian: Теодо́сій Григо́рович Добжа́нський; Russian: Феодо́сий Григо́рьевич Добржа́нский) , Ph.D. (University of Leningrad, 1927; B.S., Biology, University of Kiev, 1921), was a prominent geneticist and evolutionary biologist, one of the central figures in modern evolutionary synthesis; his major work concerning the latter is "Genetics and the Origin of Species", published in 1937. He emigrated to the USA in 1927 on a scholarship from the Rockefeller Foundation.
Dobzhansky was the recipient of the National Medal of Science in 1964 and the Franklin Medal in 1973.