Question: What occupation did the screenwriter of Marathon man and All the President's men have before screenwriting?

Context paragraphs:
Richard Walter (writer): Richard Walter is an American author, educator, screenwriter, commentator, consultant and chairman of the University of California, Los Angeles graduate program in screenwriting.  He has written several works, including the "Essentials of Screenwriting", published in June 2010, and the novels "Escape from Film School" and "Barry and the Persuasions".  Other publications include screenwriting books "The Whole Picture: Strategies for Screenwriting Success in the New Hollywood" and "Screenwriting: The Art, Craft and Business of Film and Television Writing".  He has written numerous feature assignments for the major studios and has sold material to all of the Big Three television networks.  He has also written many informational, educational and corporate films, and is a 30-year member of the Writers Guild of America.

William Goldman: William Goldman (born August 12, 1931) is an American novelist, playwright, and screenwriter.  He came to prominence in the 1950s as a novelist, before turning to writing for film.  He has won two Academy Awards for his screenplays, first for the western "Butch Cassidy and the Sundance Kid" (1969) and again for "All the President's Men" (1976), about journalists who broke the Watergate scandal of President Richard Nixon.  Both films starred Robert Redford.

Tinsel (novel): Tinsel is a 1979 novel written by William Goldman.  It was the third of a four-book deal he had with Delacorte Press after "Marathon Man" and "Magic".  He called it "my Hollywood novel".  He began writing it on April Fools' Day 1978 and finished it five months' later.

William Froug: William Froug (May 26, 1922 – August 25, 2013) was an American television writer and producer.  His producing credits included the series "The Twilight Zone", "Gilligan's Island", and "Bewitched".  He was a writer for such shows as "Adventures in Paradise", "The Dick Powell Show", "Charlie's Angels", and "The New Twilight Zone".  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.

Hot Shots!: Hot Shots!  is a 1991 comedy film which stars Charlie Sheen, Cary Elwes, Valeria Golino, Lloyd Bridges, Jon Cryer, Kevin Dunn, Kristy Swanson, and Bill Irwin.  It was directed by Jim Abrahams, co-director of "Airplane! ", and was written by Abrahams and Pat Proft.  It was followed by a sequel, "Hot Shots!  Part Deux" in 1993.  Both Sheen and Cryer would later costar in the TV series "Two and a Half Men", with Ryan Stiles playing a recurring role.  The film is primarily a parody of "Top Gun", with some scenes spoofing other popular films, including "9½ Weeks", "Dances with Wolves", "Marathon Man", "Rocky", "Superman" and "Gone with the Wind".

Bangalore Marathon: The Bangalore Marathon is a marathon running event in the Indian city of Bangalore.  It was originally organised by Lipton, and first ran on May 15, 2005.  The winners were K.C. Ramu of India (men's), and Marashet Jimma of Ethiopia (women's).  The second marathon was scheduled for September 17, 2006.  The winners were, in the full marathon men's division, H A Chinnappa, with a time of 2:35:19, in the full marathon women's division, Deepthi Ashok, with a time of 4:13:13, in the half marathon men's division, Irappa D Akki, with a time of 1:04:21, and in the half marathon women's division, K B with a time of 1:23:55.

Todd Klick: Todd Klick is an American author, screenwriter, director and producer based in Los Angeles.  His book, "Something Startling Happens: The 120 Story Beats Every Writer Needs To Know" became a #1 bestseller on Amazon.com for Screenwriting and Writing Skills.  It is also a bestseller for his publisher, Michael Wiese Publications.  Klick is also the author of the eBook "The Screenwriter's Fairy: The Universal Story Within All Movie Stories (a very brief fable)", which has also been #1 on Amazon for Screenwriting., and is a contributing author for the #1 bestselling Tarcher-Penguin book, "Now Write!  Science Fiction, Fantasy and Horror: Speculative Genre Exercises from Today’s Best Writers and Teachers".  Klick leads seminars at screenwriting conferences and symposiums and is a contributor to The Huffington Post and MovieMaker Magazine.

Gus Worland: Marathon Man: Gus Worland: Marathon Man is an Australian reality television series which premiered on A&E on 9 May 2014.

Stefaan Engels: Stefaan Engels (born 7 April 1961, Ghent, Belgium), also known as "marathon man", is a Belgian marathoner and triathlete, the first man to run the marathon distance 365 consecutive times in a single year.  He also holds the record for the most Ironman Triathlons in a year with 20 over 2007 and 2008.

Marathon Man (film): Marathon Man is a 1976 American suspense-thriller film directed by John Schlesinger.  It was adapted by William Goldman from his 1974 novel of the same name and stars Dustin Hoffman, Laurence Olivier, Roy Scheider, William Devane and Marthe Keller.  The music score was composed by Michael Small.

Supporting paragraphs: Marathon Man (film) William Goldman
Answer: novelist