W. Ripley Ballou, MD is Vice President and Head, Global Vaccines US R&D Center located in Rockville, Maryland USA. Previously he served as VP & Head Clinical Research & Translational Science for GSK Vaccines in Rixensart, Belgium. Prior to this he served as Deputy Director for Vaccines, Infectious Diseases Development, Global Health at the Bill & Melinda Gates Foundation. Dr. Ballou is an expert in vaccine development and has worked in this field for more than 30 years. Trained in Internal Medicine and Infectious Diseases, he began his work on vaccines at the Walter Reed Army Institute of Research where he led the team that with GlaxoSmithKline co-developed RTS,S, the world’s most advanced malaria vaccine. Dr. Ballou has numerous publications in the field of vaccine development and infectious diseases.