Jacqueline Deen, MD, trained in pediatrics at the University of Nebraska Medical Center, Omaha, and in pediatric infectious diseases at the University of California Medical Center, Los Angeles.She obtained a master's degree in public health in developing countries at the London School of Hygiene and Tropical Medicine. She has worked as a clinical researcher at the Medical Research Council in The Gambia, as a consultant for the World Health Organization, and as a scientist at the International Vaccine Institute in Seoul, Korea. She has extensive experience in Asian and African countries in cholera surveillance and in diagnostic studies and effectiveness trials of the oral cholera vaccine.