Walter Granger was one of the first paleontologists in the newly formed Department of Vertebrate Paleontology in the early 1890s. Like Roy Chapman Andrews, Granger started out low in the hierarchy, but by 1894, he went west to collect Jurassic dinosaurs at Bone Cabin Quarry, in Wyoming. Granger was a superb field paleontologist. As chief paleontologist on the Central Asiatic Expeditions, he was responsible for superb collections and discoveries. Granger's most influential scientific contributions were in the early evolution of mammals. Nonetheless, he worked during a time when there was less specialization, and he made considerable contributions to our knowledge of dinosaurs as well.