Bone Wars
He was a part-time professor at what later became the Colorado School of Mines. Having sent a fossilized vertebra specimen (from the Morrison Formation of Dakota, US) to Othniel Charles Marsh, in 1877, he was then employed by Marsh to seek other discoveries, in the so-called Bone Wars. He went on to unearth fossilized remains of "Stegosaurus", "Apatosaurus", "Camptosaurus", "Tyrannosaurus rex" and "Allosaurus".