Wade Davis has studied the zombie phenomenon extensively. He is author of The Serpent and the Rainbow, a chronicle of his experiences in Haiti while trying to locate the zombie poison.
Christian R�tsch, Ph.D., is a world-renowned anthropologist and ethnopharmacologist who specializes in the shamanic uses of plants. He is the author of Marijuana Medicine and coauthor of Plants of the Gods, Shamanism and Tantra in the Himalayas, Witchcraft Medicine, and The Encyclopedia of Psychoactive Plants. He lives in Hamburg, Germany, and lectures around the world.