Aaron Tobian is an Associate Professor of Pathology, Medicine and Epidemiology at The Johns Hopkins University School of Medicine and Bloomberg School of Public Health. He is also an Associate Medical Director of Transfusion Medicine at Johns Hopkins Hospital and Investigator with the Rakai Health Sciences Program in Uganda. Dr. Tobian completed a combined MD/PhD program at Case Western Reserve University. During medical school, he was elected into the Alpha Omega Alpha (AOA) Honor Medical Society. He completed a clinical pathology residency and transfusion medicine fellowship at Johns Hopkins Hospital and subsequently joined the faculty at Johns Hopkins University. Dr. Tobian has collaborated with the Rakai Health Sciences Program and established a research program evaluating the epidemiologic risk factors of HIV and other sexually transmitted infections. Dr. Tobian has evaluated the efficacy of male circumcision to prevent sexually transmitted infections, including human papillomavirus, in men and their female partners. Dr. Tobian has also assessed the risk factors of human papillomavirus acquisition and clearance and the role of human papillomavirus infection and its association with HIV acquisition.