George K. Siberry, MD, MPH, is a Medical Officer at the Maternal and Pediatric Infectious Disease Branch of NICHD, NIH, in Bethesda, Maryland (USA). He received his MD from the Johns Hopkins University (JHU) School of Medicine and MPH in International Health from the JHU School of Public Health. He completed his pediatric residency and pediatric infectious disease fellowship at the JHU School of Medicine. He joined the JHU faculty in 2003 as Director of the Harriet Lane Clinic and then moved to NIH in 2008. He attends weekly clinic at JHU for for children and youth with HIV infection. He is an active panel member for the US federal guidelines on antiretroviral therapy for HIV-infected children, US federal guidelines for prevention and treatment of opportunistic infections in HIV-infected children, and the WHO HIV treatment guidelines. He co-authors pediatric HIV chapters in Mandell’s Principles and Practice of Infectious Diseases and Long and Pickering’s Principles and Practice of Pediatric Infectious Diseases. He is Associate Chief Editor for the Pediatric Infectious Disease Journal, responsible for HIV-related submissions. His current research interests focus on prevention, treatment and complications of HIV infection in children through several US-based and international HIV research networks.