Who is Dr. Fleming from Becoming a Doctor: A Journey of Initiation in Medical School and what is their importance?

Dr. Fleming is the name of a former Jesuit priest and psychiatrist. He made a memorable impact on Konner with his "four laws of medicine." Fleming declared that doctors 1) keep doing things that work, 2) stop doing things that don't work, 3) do nothing if you don't know and 4) never call a surgeon.