Dr.Maurice R. Hilleman, Ph.D. Director of Merck Institute of Vaccinology and Adjunct Professor of pediatrics, Medical School of the University of Pennsylvania, is considered a leading scientist in vaccinology. He has pioneered 36 licensed vaccines including Japanese encephalitis B, measles, mumps, rubella, combined MMR, purified poliovaccine, varicella, hepatitis A, hepatitis B. Most importantly, these vaccines have been effective in preventing diseases in young children. The measle vaccine has reduced the death rate in children from 8 million to 1 million. In all, Dr.Hilleman's pioneering work has saved the lives of over 2 million patients annually.