Sir Alexander Fleming
Born August 6, 1881; died March 11, 1955 at the age of 73.
In 1928, while working on the flu virus, he discovered that the mold had accidentally developed on a staphylococcal culture plate and that the mold had formed a bacteria-free circle around it. An active substance called penicillin has started a highly effective antibiotic treatment for infectious diseases. In 1945, Fleming shared the Nobel Prize in Physiology or Medicine with Ernst Boris Chain and Howard Walter Florey, who continued Fleming’s work.