Charles W. Flexner, M.D., is Professor of Medicine in the Divisions of Clinical Pharmacology and Infectious Diseases, and Professor of Pharmacology and Molecular Sciences in the Johns Hopkins University School of Medicine. He is also Professor of International Health in the Johns Hopkins University Bloomberg School of Public Health. Dr. Flexner is an expert on the basic and clinical pharmacology of drugs for HIV/AIDS and related infections, including viral hepatitis and tuberculosis. His scientific contributions include work on the important roles of pharmacokinetic enhancement, medication adherence, and dosing frequency in the long-term management of HIV/AIDS. He led clinical development teams for seven HIV-related new molecular entities, as well as randomized, prospective trials of once-daily versus twice-daily combination antiretroviral regimens. He has published extensively on anti-infective drug transport and metabolism, and metabolic drug interactions. His current research includes the discovery and development of new molecules and formulations for long-acting parenteral administration for treatment and prevention of HIV infection. He directs the Long Acting/Extended Release Antiretroviral Research Resource Program (LEAP; www.longactinghiv.org), and is Co-Principal Investigator of the Johns Hopkins University Baltimore-Washington-India Clinical Trials Unit (BWI CTU). Dr. Flexner is the Deputy Director of the Institute for Clinical and Translational Research at Johns Hopkins. He also serves as Associate Vice-Chair for Academic Fellowship Programs in the Department of Medicine, and Associate Director of the Graduate Training Programs in Clinical Investigation of the Johns Hopkins University School of Medicine and Bloomberg School of Public Health. He was Chair of the AIDS Clinical Trials Group (ACTG) Translational Research and Drug Development (TRADD) Committee from 2009-2011. Dr. Flexner served as President of the American Federation for Medical Research (AFMR) from 1999-2000, and was President of the AFMR Foundation from 2001-2002. He is a member of the editorial board of 11 scientific journals. He currently serves as a consultant to the Bill and Melinda Gates Foundation and the Clinton Health Access Initiative, and served as a consultant on FDA reform to the United States House of Representatives.