William Osler
Doctor
Medical doctor who was one of the four founders of the Johns Hopkins Hospital.
After settling in to run the medical program at the University of Pennsylvania, he started the Association of American Physicians.
He instituted the tradition of medical residency, where students practiced under licensed physicians before receiving their own license.
His father was a renowned sailor--either as a merchant or as a pirate, the truth of the matter was up for debate.
His wife's great-grandfather was Paul Revere.