In all, he dedicated nearly half-a-century to the study. Crampton taught as a professor at Columbia University and Barnard College from 1904 to 1943. He also worked as a curator at the American Museum of Natural History.
He spent nearly five decades focused on his area of expertise. Crampton taught as a professor at Columbia University and Barnard College from 1904 to 1943, and also worked as a curator at the American Museum of Natural History, where he contributed significantly.