Donald R. Prothero is a paleontology and geology researcher, teacher, and author. He is adjunct professor of geological sciences at California State Polytechnic University, Pomona, and research associate in vertebrate paleontology at the Natural History Museum of Los Angeles County. His Columbia University Press books include The Story of Life in 25 Fossils: Tales of Intrepid Fossil Hunters and the Wonders of Evolution (2015) and The Story of the Earth in 25 Rocks: Tales of Important Geological Puzzles and the People Who Solved Them (2018).