Matt Tierney is a nurse practitioner who cares for patients experiencing mental health and substance-related problems. In research, Tierney focuses on how health systems manage patients with substance use disorders, including how providers engage with them, the effectiveness of federal and state treatment policies, and how well screening and interventions work. Additionally, he trains graduate students and practicing providers to provide mental health care and care related to substance use. https://www.ucsfhealth.org/providers/matt-tierney