Theodosius Dobzhansky

Theodosius Dobzhansky (1900-1975) was a Ukrainian-born American geneticist and evolutionary biologist who immigrated to the United States in 1927 and became a citizen in 1937. He was a central figure in the modern evolutionary synthesis, working with Thomas Hunt Morgan on Drosophila genetics at Columbia and Caltech, later at Rockefeller University and UC Davis. His notable work Genetics and the Origin of Species (1937) integrated genetics with Darwinian evolution, establishing evolutionary genetics as a discipline.