1863-1946 (83 years old)
Year of great discovery/work
Trained as a pathologist and bacteriologist, Flexner studied what made people sick. He’s credited with discovering and developing the serum used to treat meningitis. He was also instrumental in the early 20th century movement of making medicine a relevant part of the scientific community.
Two of his lab assistants became directors at Memorial Sloan Kettering Cancer Center, a leading U.S. cancer hospital.