Episode 20 of the MAPS Podcast brings you Dr. William Richards and his talk "Psychedelic Psychotherapy: Insights from 25 Years of Research". From Psychedelic Science 2013 this talk reflects on his past involvement in clinical research with psychedelic substances at the University of Göttingen and the Maryland Psychiatric Research Center, and in the current investigations at the Johns Hopkins School of Medicine, Dr. Richards will discuss the discrete alternative states of consciousness that appear to facilitate psychotherapeutic progress, and the factors of set, setting, and dosage that increase the probability of their occurrence. William A. Richards, PhD, is a psychologist in the Psychiatry Department of the Johns Hopkins University School of Medicine, Bayview Medical Center, currently pursuing research with entheogens, and also a clinician in private practice in Baltimore. From 1977-1981, he was a member of the psychology faculty of Antioch University in Maryland. His publications began in 1966 with "Implications of LSD and Experimental Mysticism," coauthored with Walter Pahnke, and published in the Journal of Religion and Health.