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George Gaylord Simpson (June 16, 1902 – October 6, 1984) was an American paleontologist. He was an expert on extinct mammals and their intercontinental migrations. Simpson was the most influential paleontologist of the twentieth century and a major participant in the Modern synthesis, contributing Tempo and Mode in Evolution (1944) and Principles of Classification and a Classification of Mammals (1945). Among other things, he is notable for anticipating such concepts as punctuated equilibrium (in his 1944 work, see quantum evolution), and dispelling the myth that the evolution of the horse was a linear process culminating in the modern Equus caballus.