Description: (American Paleontologist Known for His Contributions to Evolutionary Theory)
George Gaylord Simpson, a renowned American paleontologist, made significant contributions to evolutionary biology. He played a key role in the modern synthesis and authored notable works like Tempo and Mode in Evolution, The Meaning of Evolution, and The Major Features of Evolution. Simpson specialized in extinct mammals and their migrations, focusing on Mesozoic and North and South America. His work also advanced the understanding of evolutionary processes, mammal taxonomy, and the acceptance of plate tectonics theory.