Question: What occupation did the screenwriter of Marathon man and All the President's men have before screenwriting?
Sentence (from "William Froug"): He authored numerous books on screenwriting, including "Screenwriting Tricks of the Trade", "Zen and the Art of Screenwriting I and II, The Screenwriter Looks at The Screenwriter", and "How I Escaped from Gilligan's Island: Adventures of a Hollywood Writer-Producer," published in 2005 by the University of Wisconsin Press.
Relevant evidence: No