Michael James Winkelman, Ph.D. (University of California-Irvine 1985) retired from the School of Human Evolution and Social Change at Arizona State University in 2009. He was President of the Anthropology of Consciousness and Anthropology of Religion Sections of the of the American Anthropological Association. Winkelman has engaged in cross-cultural and interdisciplinary research on shamanism, psychedelics and ritual alterations of consciousness, focusing on the universal patterns of shamanism and identifying the associated biological bases. Shamans, Priests and Witches (1992) provides a cross-cultural examination of the nature of shamanism and magico-religious practitioners. Shamanism: A Biopsychosocial Paradigm of Consciousness and Healing (2010) provides a biogenetic model of shamanism that explains the evolutionary origins of spiritual healing in ancient ritual capacities. This biogenetic structural approach to the evolutionary origins of religion is expanded in his co-authored Supernatural as Natural (with John Baker, 2008). Winkelman’s work has shown that shamanism and psychedelics have a deep intersection in human evolution; these capacities for altering consciousness continue to be an important part of human experience and well-being today.