Claudia M�ller-Ebeling, Ph.D., is an art historian and anthropologist and coauthor, with Christian R�tsch, of Shamanism and Tantra in the Himalayas, Witchcraft Medicine, and Pagan Christmas. She lives in Hamburg, Germany.
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.