Robert Bakker (1945–) is an American paleontologist; he was previously at the Morrison Natural History Museum in Morrison, Colorado, but more recently lectures and hunts for dinosaur fossils at Como Bluff, Wyoming. Like his mentor John Ostrom, Bakker has helped reshape modern theories about dinosaurs, particularly arguing in favor of the theory that some dinosaurs were warm-blooded (endothermic); he has expanded and/or changed many conventional ideas about dinosaur behavior; and he was also one of the first paleontologists to suggest that many dinosaurs had feathers. He is the author of many books, including Dinosaur Heresies, Raptor Red, Maximum Triceratops, and Raptor Pack.