Will Van Derveer, MD is a psychiatrist and psychotherapist with several years of experience participating in indigenous shamanic medicine ceremonies abroad. He has facilitated integration for retreat participants during and after retreats with Gabor Mate MD. Dr. Van Derveer is a study physician and psychotherapist on multiple MAPS clinical trials, evaluating MDMA psychotherapy for PTSD. In this context, he has provided study subjects preparation and integration sessions as well as MDMA psychotherapy. He has practiced integrative psychiatry in Boulder, CO since 2002, and teaches psychiatric providers and psychiatry trainees how to heal people without relying solely on medications.