Sir William Osler, 1st Baronet, (; July 12, 1849 – December 29, 1919) was a Canadian physician and one of the "Big Four" founding professors of Johns Hopkins Hospital. Osler created the first residency program for specialty training of physicians, and he was the first to bring medical students out of the lecture hall for bedside clinical training. He has frequently been described as the Father of Modern Medicine and one of the "greatest diagnosticians ever to wield a stethoscope". Osler was a person of many interests, who in addition to being a physician, was a bibliophile, historian, author, and renowned practical joker. Outside of medicine, he was passionate about medical libraries and medical history and among his achievements were the founding of the History of Medicine Society (formally "section"), at the Royal Society of Medicine, London. In the field of librarianship he was instrumental in founding the Medical Library Association of Great Britain and Ireland, the (North American) Association of Medical Librarians (now known as the Medical Library Association) with three others, including Margaret Charlton, the medical librarian of his alma mater, McGill University. He left his large history of medicine library to McGill, where it continues to exist as the Osler Library.