Why Famous: Best-known for discovering the enzyme lysozyme in 1923 and the antibiotic substance penicillin from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.
- 1915-12-22 Biologist Alexander Fleming (34) weds Sara McElroy
- 1953-04-09 Biologist Alexander Fleming (71) weds doctor Amalia Koutsouri-Vourekas (41)
- 1928-09-15 Scottish bacteriologist Alexander Fleming discovers penicillin while studying influenza
- Alexander Fleming (1881-1955) - Science Hall of Fame, National Library of Scotland