Dr. med., born in 1960, married, three children. Physician for psychiatry and psychotherapy, working in private practice in Solothurn, Switzerland. He was trained in psychodynamic methods as well as in therapy with mind altering drugs, i.e. psycholytic or psychedelic therapy. He is member of the Swiss Medical Society for Psycholytic Therapy since 1992 and its president since 1997. From 2007 until 2012 he conducted a pilot study with LSD-assisted psychotherapy which was the first therapeutic study with LSD after the worldwide ban of the substance in the 1970ies. A second phase II study with a larger number of participants in collaboration with the University of Basel, followed from 2017 until 2021. Its results will be published in 2022. Since 2014 P. Gasser holds a number of individual treatment permissions often called “compassionate use” or “limited medical use” for the treatment with MDMA and LSD. These permissions are issued by the Swiss Federal Office for Public Health. P. Gasser is also working as a supervisor and trainer for psychedelic therapy.