Carl Ruck is best known for his work in mythology and religion on the sacred role of entheogens as used in religious or shamanistic rituals. His focus has been on the use of entheogens in classical western culture, as well as their historical influence on modern western religions. He currently teaches at Boston University. Mark Alwin Hoffman, with degrees in Religious Studies and Philosophy from San Diego State University and based in Taos, New Mexico, is editor of Entheos: The Journal of Psychedelic Spirituality. He has written on shamanism, ancient religions, early Christianity, and the role of visionary sacraments in western mystery tradition. Jose Alfredo Gonzalez Celdran is a professor of ancient Greek based in Murcia, Spain, and is the author of Las Puertas de Moeris, an historical novel, and Homres, Dioses, y Hongos (Men, Gods, and Mushrooms) on the role of psychoactive mushrooms in myth and religion, as well as essays in collaboration with an archaeologist on entheogens.
