Scottish biologist, physician, microbiologist, and pharmacologist Alexander Fleming died on this day, March 11, in 1955. Known best for his discovery of the world’s first antibiotic substance benzylpenicillin (Penicillin G) 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.

Yousuf Karsh photographed dozens of subjects related to the world of medicine, including several Nobel Prize winners. All 15,000+ sittings are searchable on this website. Or search on a keyword such as “medicine” and see who you find!