Graham Hancock is a researcher, journalist, and author of over a dozen books including "Fingerprints of the Gods" and "America Before: The Key to Earth's Lost Civilization."

Attorney and scholar Brian C. Muraresku is the author of The Immortality Key: The Secret History of the Religion with No Name. Featuring an introduction by Graham Hancock, The Immortality Key is a look into the psychedelic origins of the world's great spiritual practices and what those might mean for how we view ourselves and the world around us. Hancock's most recent book is America Before: The Key to Earth's Lost Civilization, now available in Paperback.