Dr. Brian Rush is Emeritus Scientist at the Institute for Mental Health Policy Research at the Centre for Addiction and Mental Health in Toronto, Senior Scientist with the Homewood Research Institute and Professor in the Dalla Lana School of Public Health and Dept. of Psychiatry at the University of Toronto. Trained with a PhD in epidemiology and biostatistics, Brian has worked for over 45 years on mental health and substance use services research, his work spanning survey research, needs-based planning, validation of screening and assessment tools, and development and implementation of perception-of-care, outcome monitoring and performance measurement tools and processes. Over the years Brian has led major treatment system reviews and evaluations in many Canadian jurisdictions and prepared several syntheses of research evidence, including concurrent disorders, collaborative care, psychedelic-assisted therapy and traditional medicine, rapid access services, and mental health and substance use service and sector-level integration.