Graham Hancock is an explorer and journalist with a passion for sacred plants and ancient civilizations. Graham is the author of the major international bestsellers The Sign and The Seal, Fingerprints of the Gods, and Heaven's Mirror. His books have sold more than five million copies worldwide and have been translated into 27 languages. Graham is one of the world's leading experts on the historical use of psychedelics. He has become recognised as an unconventional thinker who raises controversial questions about humanity's past, including the belief that psychedelics played a key role in the intellectual evolution of humanity and can help save mankind from going extinct.