Question: Which occupation was common to Rudolph Polk and Joel Schumacher ?
Context: Falling Down is a 1993 thriller film directed by Joel Schumacher and written by Ebbe Roe Smith.  The film stars Michael Douglas in the lead role of William Foster, a divorced and unemployed former defense engineer.  The film centers on Foster as he treks on foot across the city of Los Angeles, trying to reach the house of his estranged ex-wife in time for his daughter's birthday party.  Along the way, a series of encounters, both trivial and provocative, cause him to react with increasing violence and make sardonic observations on life, poverty, the economy, and commercialism.  Robert Duvall co-stars as Martin Prendergast, an aging LAPD Sergeant on the day of his retirement, who faces his own frustrations, even as he tracks down Foster. Rudolph ("Rudy") Polk (25 November 1892 New York, New York – 16 June 1957 Los Angeles) was an American concert violinist based in New York City during his early years and, during his later years, a Hollywood film director, film industry executive, and artist manager for Jascha Heifetz, Vladimir Horowitz, José Iturbi, and Gregor Piatigorsky.  In Hollywood, Polk was the assistant musical director to Morris Stoloff at Columbia Pictures.  After World War II, Polk was musical director for Enterprise Studios. The fictional superhero Batman, who appears in American comic books published by DC Comics, has appeared in various films since his inception.  Created by Bob Kane and Bill Finger, the character first starred in two serial films in the 1940s, "Batman" and "Batman and Robin".  The character also appeared in the 1966 film "Batman", which was a feature film adaptation of the 1960s "Batman" TV series starring Adam West and Burt Ward, who also starred in the film.  Toward the end of the 1980s, the Warner Bros. studio began producing a series of feature films starring Batman, beginning with the 1989 film "Batman", directed by Tim Burton and starring Michael Keaton.  Burton and Keaton returned for the 1992 sequel "Batman Returns", and in 1995, Joel Schumacher directed "Batman Forever" with Val Kilmer as Batman.  Schumacher also directed the 1997 sequel "Batman & Robin", which starred George Clooney.  "Batman & Robin" was poorly received by both critics and fans, leading to the cancellation of "Batman Unchained". Cousins is a 1989 American romantic comedy film directed by Joel Schumacher and starring Ted Danson, Isabella Rossellini, Sean Young, William Petersen, Keith Coogan, Lloyd Bridges and Norma Aleandro.  The film is an American remake of the 1975 French comedy "Cousin Cousine", directed by Jean-Charles Tacchella.  It was filmed in Vancouver, British Columbia, Canada but set in Seattle. Joel T. Schumacher (born August 29, 1939) is an American film director, screenwriter, and producer. Slow Burn is a 1986 American television drama film noir presented by Joel Schumacher and directed by Matthew Chapman.  Chapman also adapted screenplay from the novel of named "Castles Burning".  Film stars include Eric Roberts, Beverly D'Angelo, Dennis Lipscomb, Raymond J. Barry, Johnny Depp, Anne Schedeen, Henry Gibson and Dan Hedaya. The Incredible Shrinking Woman is a 1981 American science fiction comedy film directed by Joel Schumacher (in his directing debut), written by Jane Wagner and starring Lily Tomlin, Charles Grodin, Ned Beatty, John Glover and Elizabeth Wilson.  This film is a take-off on the 1957 science fiction classic film "The Incredible Shrinking Man", and credited as based on Richard Matheson's 1956 novel, "The Shrinking Man".  The original music score was composed by Suzanne Ciani. The Number 23 is a 2007 American psychological thriller film written by Fernley Phillips and directed by Joel Schumacher.  Jim Carrey stars as a man who becomes obsessed with the 23 enigma once he reads about it in a strange book that seemingly mirrors his own life.  The film was released in the United States on February 23, 2007.  This is the second film to pair Schumacher and Carrey, the first being "Batman Forever".  The film grossed $77.6 million and has an approval rating of 8% on Rotten Tomatoes.  Carrey was nominated for a Golden Raspberry Award for Worst Actor for his performance in the film, but he lost to Eddie Murphy for "Norbit". Colin James Farrell (born 31 May 1976) is an Irish actor.  Farrell appeared in the RTE Irish drama "Ballykissangel" in 1998, made his film debut in the Tim Roth-directed drama "The War Zone" in 1999, and was discovered by Hollywood when Joel Schumacher cast him in the lead role in the war drama "Tigerland" in 2000.  He then starred in Schumacher's psychological thriller "Phone Booth" (2002) where he plays a hostage in a New York city phone booth and the American thrillers "S.W.A.T." (2003) and "The Recruit" (2003), establishing his international box-office appeal.  During that time, he also appeared in Steven Spielberg's science fiction thriller "Minority Report" (2002) and as the villain Bullseye in the superhero film "Daredevil" (2003). D.C. Cab (also known as Street Fight) is a 1983 American comedy film, starring Max Gail, Adam Baldwin, Mr. T, Charlie Barnett, Gary Busey, Marsha Warfield, and Whitman Mayo.  The film was written and directed by Joel Schumacher with the story by Topper Carew & Schumacher.
Answer: film director,