One of his main themes is a “mother culture” which he believes helped spring all ancient historical civilizations. Hancock has authored several books including Ethiopia: The Challenge of Hunger, AIDS: The Deadly Epidemic, Lords of Poverty: The Power, Prestige, and Corruption of the International Aid Business, The Sign and the Seal: The Quest for the Lost Ark of the Covenant, Fingerprints of the Gods: The Evidence of Earth’s Lost Civilization, The Message of the Sphinx: A Quest for the Hidden Legacy of Mankind, The Mars Mystery, Heaven’s Mirror, Underworld, Talisman, Supernatural, Entangled, War God, and Magicians of the Gods.