'''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. | '''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. |