Professor Kelly joined the faculty at Purdue University in 2006. He is currently the Director of Purdue's Center for Research on Young People's Health. He has authored or co-authored publications in sociology journals such as Sociology of Health & Illness, Journal of Health & Social Behavior, Sociological Quarterly, & Deviant Behavior, as well as public health journals, such as AIDS & Behavior, Addictive Behaviors, & Drug and Alcohol Dependence. His topical areas of research interest include substance use, sexual health, HIV/AIDS, and comparative youth cultures. The foci of his recent research projects include contextual influences of prescription drug misuse among youth, influence of tobacco policy contexts on youth smoking trajectories, and the health and well-being of adolescent girls in age discordant relationships.