Roger Walsh, MD, PhD, is a professor of psychiatry, philosophy, and anthropology at the University of California Irvine. Dr. Walsh authored The World of Shamanism, among other books. He received degrees in psychology, physiology, neuroscience, and medicine from Australia’s Queensland University. We discuss shamanism, altered states, stages of adult psychological development, the power of rituals, and much more. FitMind Neuroscience-Based App: http://bit.ly/afitmind Website: www.fitmind.co