DONALD R. PROTHERO specializes in physics, planetary sciences, astronomy, earth sciences, and vertebrate paleontology. He taught for 35 years at the college level at Columbia, Knox, Pierce, and Vassar Colleges, most recently as professor of geology at Occidental College, and lecturer in geobiology a...

DONALD R. PROTHERO specializes in physics, planetary sciences, astronomy, earth sciences, and vertebrate paleontology. He taught for 35 years at the college level at Columbia, Knox, Pierce, and Vassar Colleges, most recently as professor of geology at Occidental College, and lecturer in geobiology at the California Institute of Technology. He has authored or edited more than 30 books and 300 scientific papers.