My research focuses on adolescent and young adult substance use: assessment and diagnosis, clinical course, prevention and early intervention. Current projects evaluate the use of mobile technology for substance use assessment and intervention. Another line of research examines social determinants of health and racial/ethnic disparities in substance use risk across multiple levels of analysis (e.g., individual, interpersonal, neighborhood) in the Adolescent Brain and Cognitive Development Study, a large longitudinal national sample of youth to inform prevention efforts and advance health equity.