'''George Gaylord Simpson''' was one of the great [[American]] [[paleontology|paleontologist]]s of the 20th century. In countless scientific papers and in books such as ''Tempo and Mode in Evolution'' and ''The Meaning of Evolution'', he revolutionized the study of evolutionary paleontology.
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'''George Gaylord Simpson''' was a prominent [[American]] [[paleontology|paleontologist]]s of the 20th century. In countless scientific papers and in books such as ''Tempo and Mode in Evolution'' and ''The Meaning of Evolution'', he revolutionized the study of evolutionary paleontology.