Michael J. Winkelman, Ph.D. (University of California-Irvine) is retired from the School of Human Evolution and Social Change at Arizona State University. Winkelman served as President of the Anthropology of Consciousness and Anthropology of Religion Section of the American Anthropological Association. Winkelman engages in cross-cultural and interdisciplinary research on shamanism, psychedelics, and the alteration of consciousness. Shamanism: A Biopsychosocial Paradigm of Consciousness and Healing [2nd ed., 2010] use cross-cultural and evolutionary methods to examine these ancient spiritual and ritual healing capacities. He co-edited Psychedelic Medicine (2007), Advances in Psychedelic Medicine (2019) and a Frontiers in Psychology special issue on Psychedelic Sociality, and a special issue of the Journal of Psychedelic Studies on Psychedelics in History and World Religions. He recently edited the Handbook of Entheogenic Healing (Brill, 2025). He served as an expert witness for Santo Daime in their defense against the US Department of Justice in 2009.