I am a Professor and Chair of Epidemiology, Professor of Behavioral and Scoial Sciences, and Director of the Center for Epidemiologic Research. I am also Affiliated Faculty at The Fenway Institute, part of Fenway Health in Boston, MA. I also am the Co-Director of the Developmental Core for the Providence/Boston Center for AIDS Research (CFAR). My research includes identifying and understanding the underlying, multilevel risk factors for social inequities in HIV and substance use, and developing and implementing social and behavioral interventions to reduce risk among racial, sexual and gender minorities, adolescents and those in resource limited settings, both domestically and globally.