Dr. Octavio Rettig Hinojosa is a Mexican doctor who works with the sacred medicine 5­MeO­DMT found in the secretions of the Sonoran Desert Toad (Bufo Alvarius). Dr. Rettig has worked with the Seri Tribe of Sonora, Mexico, to help treat methamphetamine addicts, reintroducing the use of the medicine to the local culture that had lost it. He has learned the ancient songs and rites of the Seri from 'Don Pancho', an elder Seri shaman, and has been authorized by the council of Seri elders to use this most powerful of shamanic medicines in the West. Dr. Rettig travels extensively throughout Mexico, The US, Australia, and Europe to give lectures and lead healing ceremonies. He lives in Guadalajara, Mexico.

Rak Razam is a founding editor of Undergrowth, Australia's leading alternative arts and literature magazine, and the world's leading experiential journalist, writing about and helping shape the emergence of a new cultural paradigm in the 21st century. He is the author of the critically acclaimed book Aya: A Shamanic Odyssey and a frequent lecturer on ayahuasca and the shamanic revival sweeping the West. He lives in Melbourne, Australia.