David Hufford, Ph.D., is Senior Fellow in Spirituality at the Samueli Institute in Alexandria, Virginia. In 2007, after 33 years on the faculty of Penn State College of Medicine, Hufford retired from his position as University Professor and Chair of Medical Humanities, and Professor of Neural & Behavioral Science, and Family & Community Medicine.  He is now University Professor Emeritus of Humanities and Psychiatry at Penn State, and Adjunct Professor of Religious Studies at the University of Pennsylvania. Hufford's publications have primarily been concerned with spiritual belief and experience, and spirituality and health. His book The Terror That Comes in the Night, which reports his research on beliefs about spiritual evil found all over the world and their relationship to sleep paralysis, was recently translated into Japanese and Korean. Hufford is a founding member of the Editorial Boards of several journals including the the new journals Spirituality in Clinical Practice, and Explore: The Journal of Science and Healing, and a founding member of the Cancer Advisory Panel on Complementary and Alternative Medicine at the National Caner Institute (NIH, Bethesda).  Hufford's current research is focused on extraordinary spiritual experiences.