Brian C Kelly is Professor of Sociology. His research examines contextual and policy influences on adolescent and young adult health, mainly focusing on substance use, sexual health, and mental health. He has authored papers in sociology journals such as Journal of Health and Social Behavior, Social Science Research, Social Science & Medicine, and Social Problems, as well as health journals, such as the American Journal of Public Health, American Journal of Psychiatry, Addiction, & American Journal of Preventive Medicine. The foci of his current research projects include the influence of policy contexts on youth substance use trajectories, sibling influences of substance use, and the impact of disasters on substance use and mental health. He currently serves as Senior Editor at Addiction.