He is currently Chair of the Department of Epidemiology, as well as holding faculty positions in the Department of Biostatistics and the Department of Medicine. Dr. Horsburgh teaches courses in the Epidemiology of AIDS and the Epidemiology of Tuberculosis. He has focused his research on tuberculosis, nontuberculous mycobacterial infections and opportunistic infections in AIDS. He is a member of the AIDS Clinical Trials Group’s Tuberculosis Transformative Science Group and Chairman of the Steering Committee of RESIST-TB, an international organization dedicated to improving MDR-TB treatment through Clinical Trials. He was previously at the Centers for Disease Control, Emory University, the University of Colorado and the National Jewish Hospital.