Donald R. Prothero is a Research Associate in Vertebrate Paleontology at the Natural History Museum of Los Angeles County. He has taught college geology and paleontology for 40 years at institutions such as Columbia University, Vassar College, Knox College, and Pierce College, and currently at Cal Poly Pomona. For 27 years, he was Professor of Geology at Occidental College in Los Angeles and Lecturer in Geobiology at the California Institute of Technology in Pasadena. He earned his M.A., M.Phil., and Ph.D. degrees in geological sciences from Columbia University. He is the author of over 300 scientific papers published in leading journals and over 30 titles in geology, paleontology and evolutionary biology.