sentences:  Knox Martin Sr., painter, poet, early test pilot, was the first man to fly over the Andes mountains.Six years after his marriage, Martin Sr. was fatally injured in an automobile accident in Watertown, New York.His widow Isabel relocated with her three young sons from Salem, Virginia to New York City.After serving in the United States Coast Guard during World War II, Martin attended the Art Students League of New York on the G.I.