Dr. Spencer G. Lucas is a curator of paleontology at the New Mexico Museum of Natural History and Science. He received a BA from the University of New Mexico and his MS and PhD from Yale University. As a paleontologist and stratigrapher, he specializes in the study of late Paleozoic, Mesozoic and early Cenozoic vertebrate fossils and continental deposits, particularly in the American Southwest. Lucas has extensive field experience in the western United States as well as in northern Mexico, Costa Rica, Kazakhstan, Nicaragua, Soviet Georgia and the People’s Republic of China. He has published more than 1000 scientific articles, co-edited fourteen books and authored three books.