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Bill letson, M.D.   Bill (George William) Letson MD is Director of Vaccine Evaluation for the Pediatric Dengue Vaccine Initiative, having been appointed to this position in July of 2006. Prior to this appointment Dr. Letson conducted field vaccine trials, ran a statewide active surveillance system for Haemophilus influenzae b disease in Alaska and a national passive surveillance system for domestic Arboviruses at the Division of Vector-Borne Diseases of CDC. In addition, he has practiced state based communicable, chronic and maternal child public health and has been an active practitioner of Pediatrics at the community and/or Academic level. Dr. Letson is trained in Pediatrics, Infectious Diseases and Public Health Epidemiology. His Pediatric and Chief Residency was completed at the University of Arizona, Pediatric Infectious Diseases fellowship training at Johns Hopkins University and Public Health Training was received through the Centers for Disease Control and Prevention (CDC), including a recent fellowship in Maternal Child Health (MCH) Epidemiology. He is a fellow of the American Academy of Pediatrics. Dr. Letson spent eight years conducting field trials with Haemophilus influenza b, Rotavirus and Hepatitis A vaccines in collaborative ventures between CDC and the Indian Health Service in Alaska, the American Southwest and Great Plains regions. Dr. Letson has also practiced community Pediatrics at clinics for uninsured children and served as an attending physician at the Children¡¯s Hospital in Denver. He spent four years as Maternal Child Health Director and Chief Medical Officer for the state of Wyoming and the past 8 years as Pediatric Consultant and Maternal Child Health Epidemiologist for the state of Colorado. In each of these positions he worked on public health policy, implementation of innovative public health practices and child health advocacy. He has authored/co-authored 27 peer reviewed publications in the pediatric and public health literature, on topics ranging from vaccine preventable diseases to newborn screening issues.