A health services and policy researcher with clinical experience working with children and adults, Dr. Stein's research focuses on understanding and improving care for those with mental health and substance use disorders. He has worked extensively in school mental health, developing, evaluating, implementing, and disseminating a school-based intervention for students exposed to trauma and violence, and implementing a school-based suicide intervention program. Recent work focuses on how state and federal policies influence availability and quality of medication assisted treatment for opioid use disorders, and factors influencing the potentially inappropriate prescribing of opioid analgesics.