11 Celebrities Who Have a PhD

American musician and record producer, Gregory Walter Graffin has a PhD in zoology from Cornell University in California in the fields of anthropology, evolutionary biology, and geology. The title of his dissertation was Evolution, Monism, Atheism, and the Naturalist world-View: Perspectives from Evolutionary Biology. He is best known as a punk rock singer in Bad Religion, which he formed when he was just 15. Graffin has subsequently taught evolution and science at Cornel and at the University of California, LA.