Elmer S. Riggs

Elmer Samuel Riggs was an American paleontologist known for his work with the Field Museum of Natural History in Chicago, Illinois.

He was born in Trafalgar, Indiana, and moved with his family to Kansas at a young age. He received bachelors and masters degrees from the University of Kansas and then worked with the American Museum of Natural History. In May 1898 he joined the staff of the Field Museum . Though he was a specialist in fossil mammals, the Field Museum hired him in part to secure dinosaurs for exhibit.

Source: Wikipedia