In the field of paleontology, the scientist who did most to resolve these questions was George Gaylord Simpson (1902-1984), who was on the staff of the American Museum of Natural History for 30 years.

George Simpson was was a compact, autocratic man who had enormous physical stamina and a natural passion for efficiency in all things: travel, business and romance. He was ruthlessly efficient ...

In the field of paleontology, the scientist who did most to resolve these questions was George Gaylord Simpson (1902-1984), who was on the staff of the American Museum of Natural History for 30 years.