Alexander Fleming
Scottish bacteriologist who discovered penicillin in 1928 when he noticed a Penicillium mould killing bacteria on a contaminated culture plate. Shared the 1945 Nobel Prize in Physiology or Medicine with Florey and Chain, who developed penicillin into a practical antibiotic. The discovery transformed medicine and saved hundreds of millions of lives.
- Lived: 1881 CE – 1955 CE
- Nationality: British
- Roles: scientist
