Maurice R. Hilleman phD (1919 – 2005 ) An American microbiologist specializing in vaccinology.  His life’s work, and the vaccines he developed have saved an immeasurable number of human lives and continues to do so today, even after his death, at an estimated rate of 8 million per year.See figure one in the NLM article http://www.ncbi.nlm.nih.gov/pmc/articles/PMC557162/