Ambassador Mark R. Dybul serves as the United States Global AIDS Coordinator, leading the implementation of President Bush's Emergency Plan for AIDS Relief. From March to August 2006, he served as Acting U.S. Global AIDS Coordinator, and prior to that he held the positions of Deputy U.S. Global AIDS Coordinator and Assistant U.S. Global AIDS Coordinator.

Before coming to the Coordinator's Office, Ambassador Dybul served on the Planning Task Force for the Emergency Plan, and was the lead for the Department of Health and Human Services (HHS) for President Bush's International Prevention of Mother and Child HIV Initiative.

At HHS, he also served as the Assistant Director for Medical Affairs, National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), as well as Co-Executive Secretary of the HHS HIV therapy guidelines for adults and adolescents. He continues to be a Staff Clinician in the Laboratory of Immunoregulation at NIAID/NIH and maintains an active role as the principal investigator for clinical and basic research for U.S. and international protocols with an emphasis on HIV therapy, particularly those that may be applicable in resource-poor settings, including intermittent therapy and HIV reservoirs and immunopathogenesis. Ambassador Dybul holds the rank of assistant surgeon general and rear admiral in the U.S. Public Health Service Commissioned Corps, the uniformed service of HHS. He is also a former member of the World Health Organization's Writing Committee to develop global HIV therapy guidelines.

Ambassador Dybul received his A.B. (1985) and M.D. (1992) from Georgetown University before completing his residency in internal medicine at the University of Chicago Hospitals (1995) and a fellowship in infectious diseases at the National Institute of Allergy and Infectious Diseases (1998).