Question: Which director is American, Graham Cantwell or Mel Stuart?

full_context: Document 1: Stuart Heisler: Stuart Heisler (December 5, 1896 – August 21, 1979) was an American film and television director. He was a son of Luther Albert Heisler (1855-1916), a carpenter, and Frances Baldwin Heisler (1857-1935). He worked as a motion picture editor from 1921 to 1936, then dedicated the rest of his career to that of a film director.
Document 2: Niall McKay: Niall McKay is an Emmy award-winning Irish writer, director and film curator. He’s the writer/director of a New York based comedy series "On the Lig", a shorts programmer for the Tribeca Film Festival and curator of Irish Screen America, an Irish film festival held at USC in Los Angeles and NYU in New York. McKay is also co-founder of the production company Media Factory.
Document 3: Melville Shavelson: Melville Shavelson (April 1, 1917 – August 8, 2007) was an American film director, producer, screenwriter, and author. He was President of the Writers Guild of America, West (WGAw) from 1969 to 1971, 1979 to 1981, and 1985 to 1987.
Document 4: Steven Spielberg: Steven Allan Spielberg, {'1': ", '2': ", '3': 'KBE', '4': "} , {'1': ", '2': ", '3': 'OMRI', '4': "} (born December 18, 1946) is an American director, producer, and screenwriter. He is considered one of the founding pioneers of the New Hollywood era, as well as being viewed as one of the most popular directors and producers in film history. He is also one of the co-founders of DreamWorks Studios.
Document 5: Graham Cantwell: Graham Cantwell (born March 25, 1974) is an Irish film and television director. He is best known for directing feature film "Anton" which achieved a three-week domestic cinema release and was nominated for three Irish Film and Television Awards in 2009. His short film "A Dublin Story" was shortlisted for Academy Award Nomination in 2004 having picked up several film festival awards. In 2010 he directed a new television drama "The Guards" for TV3 in Ireland. Most recently he directed a romantic comedy set in the film industry in London, "The Callback Queen", which premiered at The Galway Film Fleadh in July 2013 and screened in the U.S. at The Jean Cocteau Cinema, owned and run by George_R._R._Martin.
Document 6: Steven Cantor: Steven Cantor is an American film/television director and film/television producer. Seven of his films have been nominated for Emmy Awards, with one winning, and he was nominated for an Academy Award for his first film. Notable works include the films "Tent City, USA", "Unraveled", "No One Dies in Lily Dale", "Reporter with Nicholas Kristof", "I Am an Animal", "", "loudQUIETloud: A Film about Pixies", "American Masters: Willie Nelson", "Devil's Playground", "", and "Dancer."
Document 7: Howard Cantour.com: Howard Cantour.com is a 2012 short film directed by actor Shia LaBeouf. The short was shown at the Cannes Film Festival on May 18, 2012, followed by an online premiere on December 17, 2013. The short film follows the eponymous internet film critic Howard Cantour, who was played by Jim Gaffigan. "Howard Cantour.com" is derived from "Justin M. Damiano", a comic by Dan Clowes, although LaBeouf did not seek permission from Clowes, or acknowledge Clowes in the film's credits.
Document 8: Graham Greene (actor): Graham Greene, CM (born June 22, 1952) is a Canadian First Nations actor who has worked on stage, in film, and in TV productions in Canada, the United Kingdom, and the United States. He was nominated for the Academy Award for Best Supporting Actor for his performance in "Dances with Wolves" (1990). Other notable films include "Thunderheart" (1992), "Maverick" (1994), "Die Hard with a Vengeance" (1995), "The Green Mile" (1999), "Skins" (2002), "Transamerica" (2005), "" (2009), "Casino Jack" (2010), "Winter's Tale" (2014), "The Shack" (2017) and "Wind River" (2017).
Document 9: Mel Stuart: Mel Stuart (born Stuart Solomon; September 2, 1928 – August 9, 2012) was an American film director and producer, who often worked with producer David L. Wolper, whose production firm he worked for 17 years, before going freelance.
Document 10: Steven C. Melendez: Steven Cuitlahuac Melendez is an American film and television director, producer and animator. He is the second son of "Peanuts" animator Bill Melendez.
Document 11: Ed Guiney: Ed Guiney (born February 18, 1966) is an Irish film producer and the co-founder of Element Pictures, best known for producing the 2015 films "The Lobster" and "Room", and 2016's "A Date for Mad Mary". He was nominated for an Academy Award for Best Picture for "Room".
Document 12: The Callback Queen: The Callback Queen is a 2013 British romantic comedy independent film by Irish director Graham Cantwell, starring a largely British and Irish cast: Amy-Joyce Hastings, Mark Killeen, Seán T. O'Meallaigh, Ger Ryan, Vicki Michelle and Eoin Macken.
Document 13: Mel Smith: Melvin Kenneth "Mel" Smith (3 December 1952 – 19 July 2013) was an English comedian, writer, film director, producer and actor.
Document 14: Stuart Baird: Stuart Baird (born 30 November 1947) is an English film editor, producer, and director who is mainly associated with action films. He has edited over twenty major motion pictures.
Document 15: John M. Stahl: John Malcolm Stahl (January 21, 1886 – January 12, 1950) was an American film director and producer.
ground_truth: Mel Stuart