Maureen Stewart, Ph.D. is a Senior Scientist and Lecturer in the Institute for Behavioral Health at the Heller School for Social Policy and Management, Brandeis University. Her research interests include the financing, payment, and organization of behavioral health services. Her research focuses on policy and system approaches improve access to and quality of alcohol and drug treatment services and to reduce racial, ethnic, and geographic disparities in substance use treatment services. As PI of two NIH-funded R01 studies (NIDA and NIAAA) Dr. Stewart is examining how Medicaid managed care plan policies influence access to and quality of alcohol and opioid use disorder treatment and racial, ethnic, gender and geographic disparities in access to and quality of substance use treatment. Dr. Stewart is also a co-investigator on several studies of the hub-and-spoke model of opioid treatment in Washington State. Dr. Stewart teaches a graduate course on health care payment and financing.