Andrew Newberg, MD, is an associate professor of Radiology and Psychiatry and an adjunct assistant professor of Religious Studies at the University of Pennsylvania, and also director of the Center for Spirituality and the Mind. He is co-author of Why God Won't Go Away and The Mystical Mind. He lives in Bryn Mawr, Pennsylvania.Mark Robert Waldmanis an associate fellow at the Center for Spirituality and the Mind at the University of Pennsylvania. A therapist and the author of nine books, he founded the academic journal Transpersonal Review. He lives in Agoura, California.

"Should be required reading for every person, young and old, who has the courage to open his or her mind and explore the biological basis of belief." -- Sandra Blakeslee, author of The Body Has a Mind of Its Own