Barnum Brown was a great US dinosaur hunter and assistant curator of the American Museum of Natural History. Brown discovered many dinosaurs, including the first T. rex specimens. He named: Anchiceratops (1914), Ankylosaurus (1908), Corythosaurus (1914), Hypacrosaurus (1913), Kritosaurus (1910), Leptoceratops (1914), Prosaurolophus (1916), Saurolophus (1912), and the family Ankylosauridae (1908). He co-named Pachycephalosaurus (1943) and Dromaeosaurus (1922) with E. M. Schlaikjer.