O.A. Peterson was a paleontologist for the Carnegie Museum of Natural History who participated in the excavations at the Carnegie Quarry. In 1893, Peterson performed excavations for the American Museum of Natural History in the Uintah Basin. According to an account by Dr. Albert C. Boyle, former Custodian of Dinosaur National Monument, Peterson had heard reports of dinosaur bones from sheep and cattle ranchers, and even informed Douglass of these findings. Peterson accompanied Douglass at the Carnegie Quarry for excavations in 1922.