Mathuram Santosham, M.D., is a professor of pediatrics and pediatric infectious diseases at Johns Hopkins, as well as professor of immunology, international health and epidemiology at the Johns Hopkins Bloomberg School of Public Health, and director of both its Health Systems Program and Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health. He is an expert in oral rehydration therapy, for which his research is world-renowned. Dr. Santosham has conducted numerous clinical trials in the U.S. and worldwide on the safety and efficacy of oral rehydration therapy and gastroenteritis. In the last 15 or more years, he has evaluated numerous pediatric vaccines among the Navajo and Apache Indian populations including Hib, Hepatitis A, rotavirus and pneumococcal vaccines. He conducted the pivotal PRP-OMP conjugate vaccine efficacy trial, which led to the licensure of the vaccine (Pedvax Hib).