Alexander Fleming, Scottish bacteriologist, 18 December 1943.

Profesor Fleming working in his laboratory at St Mary's Hospital, Paddington, London. Fleming (1881-1955) identified the antibacterial properties of the penicillium mould in 1928. The Oxford team of the Australian Howard Florey (1898-1968) and German-born British biochemist Ernst Chain (1906-1979) isolated penicillin and developed it as an antibiotic just before and during WWII.