Spiritual teacher Peter Russell earned degrees in theoretical physics, psychology, and computer science at the University of Cambridge in England, where he studied for a time with Stephen Hawking. He studied meditation and Eastern philosophy in India and later conducted research into the neurophysiology of meditation. He is the author of From Science to God, Letting Go of Nothing, and Waking Up in Time, among other books. He lives in Northern California. Eckhart Tolle is a world-renowned spiritual teacher and the author of The Power of Now. He lives in Vancouver, Canada.