Pioneering late eighteenth and early nineteenth century surgeon Dr. William S. Halsted was operated on August 25, 1922 at the age of 70 for a “biliary condition” by his own surgical team at Johns Hopkins University. He developed an early post-operative pneumonia and died on September 7, 1922.
halsted lived in the late 19th and early 20th century, not late 18th and early 19th. 1922 is the 20th century.