The taxon Protoceratopsidae was introduced by Walter W. Granger and William King Gregory in May 1923 as a monotypic family for Protoceratops andrewsi.
He developed an early interest in both fishes and the land vertebrates, publishing papers on both groups, including two in Science in 1903.
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As a curator, he assembled a remarkable team of fossil hunters and preparators, including William King Gregory, Roy Chapman Andrews, a gentleman allegedly a possible inspiration for the creation of the fictional archeologist Indiana Jones, and Charles R. Knight, who made murals of dinosaurs in their habitats and sculptures of the living creatures.