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Zach Walsh, PhD, is a clinical psychologist, a Research Affiliate with the BC Centre on Substance Use, and an Associate Professor of Psychology at the University of British Columbia, where he directs the Therapeutic, Recreational, and Problematic Substance Use lab. He has published and presented widely on topics related to psychedelics, cannabis, mental health and psychotherapy. He is the lead investigator for several ongoing studies of the therapeutic use of cannabis including a clinical trial of cannabis for PTSD, and has worked clinically on trials of psychedelic-assisted psychotherapy. Zach’s clinical focus is on the application of “third wave” mindfulness-based behavior therapies to address trauma, relationship conflict, and problematic substance use.