Theodosius Dobzhansky

The predominant and pioneering empirical evolutionary geneticist, his book Genetics and the Origin of Species (1937 and later editions) was the first and most influential of the major expositions of the Modern Evolutionary Synthesis. He was the first advocate of the Biological Species Concept, and the major advocate of the position that genetic polymorphism would prove to be largely maintained by balancing selection.

His biographical entry in the Wikipedia

The Dobzhansky Papers site at the American Philosophical Society

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