Question: Gary Kurtz was a producer on the 1973 coming-of-age film directed and co-written by whom?
Context: St. Elmo's Fire is a 1985 American coming-of-age film directed by Joel Schumacher.  The film, starring Emilio Estevez, Rob Lowe, Andrew McCarthy, Demi Moore, Judd Nelson, Ally Sheedy, and Mare Winningham, centers on a group of friends, recent graduates of Georgetown University, and their adjustment to their post-university lives and the responsibilities of encroaching adulthood.  The film is a prominent movie of the Brat Pack genre. Secret Fruit () is a 2017 Chinese coming-of-age film directed by Lien Yi-chi and starring Chen Feiyu and Nana Ou-Yang.  It is based upon the novel of the same name by Rao Xueman, who also wrote the film's screenplay.  The film was released in China on July 7, 2017. Slipstream is a 1989 science fiction film directed by Steven Lisberger, who had previously directed the cult classic 1982 science fiction film "Tron".  It was produced by Gary Kurtz, best known for his collaboration with George Lucas on the first two "Star Wars" films and "American Graffiti".  "Slipstream" reunited Kurtz with his "Star Wars" lead Mark Hamill, who features alongside Bill Paxton, Bob Peck and Kitty Aldridge, with cameo appearances from Robbie Coltrane, Ben Kingsley and F. Murray Abraham. Azhiyadha Kolangal (English: (lit.)  "Enduring Patterns" ) is a 1979 Indian Tamil-language coming-of-age film directed by Balu Mahendra, starring Prathap K. Pothan and Shobha.  Kamal Haasan played a guest role in the film.  The film was Balu Mahendra's second directorial venture and his first in Tamil.  Partly autobiographical, the film dealt with the events that happen during the adolescence of three friends who live in a small village.  In addition to directing the film, Balu Mahendra wrote the screenplay and shot the film.  The film was released on 7 December 1979.  Upon release, "Azhiyadha Kolangal" received critical acclaim, and was premièred at the "Indian Panorama" of the International Film Festival of India in 1980. The Empire Strikes Back (also known as Star Wars: Episode V – The Empire Strikes Back) is a 1980 American epic space opera film directed by Irvin Kershner.  Leigh Brackett and Lawrence Kasdan wrote the screenplay, with George Lucas writing the film's story and serving as executive producer.  The second installment in the original "Star Wars" trilogy, it was produced by Gary Kurtz for Lucasfilm and stars Mark Hamill, Harrison Ford, Carrie Fisher, Billy Dee Williams, Anthony Daniels, David Prowse, Kenny Baker, Peter Mayhew, and Frank Oz. Rathinirvedam is a 2011 Malayalam coming-of-age film directed by T. K. Rajeev Kumar and starring Shweta Menon and Sreejith.  It is a remake of the 1978 film of the same name directed by Bharathan and written by P. Padmarajan based on his own novel "Rathinirvedam".  The film was produced by Suresh Kumar under the banner of Revathy Kalamandhir. Gary Douglas Kurtz (born July 27, 1940) is an American film producer whose list of credits includes "American Graffiti" (1973), "Star Wars" (1977), "The Empire Strikes Back" (1980), "The Dark Crystal" (1982) and "Return to Oz" (1985).  Kurtz also co-produced the 1989 science fiction adventure film "Slipstream", which reunited him with "Star Wars" star Mark Hamill. 5-25-77 is a coming of age film written and directed by Patrick Read Johnson and produced by Fred Roos and Gary Kurtz.  It stars John Francis Daley as a teenage filmmaker living in Wadsworth, Illinois, and his excitement for the premiere of "Star Wars" on May 25, 1977.  Johnson began funding the project in 2001 and filming took place from 2004-2006.  Additional shots were filmed in 2015 and 2016, making the filming course span a total of thirteen years. American Graffiti is a 1973 American coming-of-age comedy-drama film directed and co-written by George Lucas starring Richard Dreyfuss, Ron Howard, Paul Le Mat, Harrison Ford, Charles Martin Smith, Cindy Williams, Candy Clark, Mackenzie Phillips, Bo Hopkins, and Wolfman Jack.  Suzanne Somers and Joe Spano also appear in the film.  Set in Modesto, California in 1962, the film is a study of the cruising and rock and roll cultures popular among the post–World War II baby boom generation.  The film is told in a series of vignettes, telling the story of a group of teenagers and their adventures over a single night. The Animals is a 2012 Filipino coming-of-age film directed by Gino M. Santos.  It is about the daily struggles of three teens living in upper middle class Manila.  The film is one of the official entries at the 8th Cinemalaya Film Festival in 2012 and won Best Editing.  The film continued to receive wide recognition, such as being nominated for Best Screenplay, Best Cinematography, and Best Musical Score at the 36th Gawad Urian Award, as well as international premieres in the Stockholm International Film Festival and the New York Asian Film Festival.
Answer: George Lucas