Matt Tierney is a Nurse Practitioner and active clinician at San Francisco General Hospital’s Opiate Treatment Outpatient Program (OTOP). The focus of his work for nearly 30 years is improving access to evidence-based addiction treatment locally, regionally and nationally, and he has created and directed numerous novel clinical programs designed to increase care for problematic substance use. Past roles include Medical Director of Inpatient Substance Use Management at UCSF Health, Clinical Director of Substance Use Treatment and Education at UCSF's Office of Population Health, and Director of San Francisco’s Office-based Buprenorphine Induction Clinic (OBIC), the first clinic in the nation devoted solely to buprenorphine treatment initiation and stabilization. He is Past President of the American Psychiatric Nurses Association (APNA) and continues to represent APNA at the National Academies of Sciences Engineering and Medicine on the Forum on Mental Health and Substance Use Disorders. In 2018 he was named a Fellow of the American Academy of Nursing, where he serves on the Expert Panel on Psychiatric Mental Health and Substance Use. With national advanced-practice certifications in Addictions Nursing (CARN-AP), Adult Primary Care (ANP), and Psychiatric-Mental Health (PMHNP), he has expertise in addressing both individual and systemic factors that are associated with substance use and addiction.