Discovered penicillin
Scottish bacteriologist (1881-1955).
Notoriously messy lab worker. Left for a 1928 holiday with petri dishes piled on his bench; came back to find a mold killing all the bacteria around it. He published the finding but never developed the drug — Florey and Chain did, a decade later, in time to save thousands of WWII soldiers.
Alexander Fleming is one of the historical characters you can play as in Rubicon, a trivia game where you answer in your own words and an AI judge reads what you meant. Alexander Fleming is filed under Human Body & Medicine, and is strongest at Human Body & Medicine and Natural Sciences.