David Ulansey received his Ph.D. (1984) in Religion from Princeton University and has taught at Boston University, the University of California at Berkeley, Barnard College (Columbia University), Princeton University, the University of Vermont, and Pacifica Graduate Institute. David is a historian of religion specializing in the religions of the ancient Mediterranean. He is particularly interested in the Mystery religions, Gnosticism, Hermeticism, ancient astronomy and cosmology, and the relationship between religion, myth, and the evolution of consciousness. He also teaches courses in Jungian thought, and has been a frequent lecturer at the C.G. Jung Institute of San Francisco. He is the author of The Origins of the Mithraic Mysteries: Cosmology and Salvation in the Ancient World (1989), as well as numerous articles in publications ranging from Scientific American to the Journal of Biblical Literature. David is also the creator and webmaster of massextinction.net, the Web's oldest and most comprehensive source of information on the current mass extinction crisis, and is the founder of the Species Alliance, a nonprofit organization committed to raising public awareness of the mass extinction and its implications for humanity and the rest of the living world. He is also the co-founder of the Planetwork Project on information technology and global change.