Robert A. Arthur Jr. (November 10 1909 Corregidor Philippines - May 2 1969 Philadelphia Pennsylvania) was a mystery and speculative fiction writer known for The Mysterious Traveler radio series and his Three Investigators series of novels. He is frequently confused with the film producer Robert Arthur who was nine days older than the mystery writer Robert Arthur Jr.[citation needed]Arthur was a graduate of the University of Michigan. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Artist