Question: Who directed the 2014 biographical war drama film starring Keir O'Donnell?
Context: Leopard in the Snow is a 1978 British drama film directed by Gerry O'Hara and starring Keir Dullea, Susan Penhaligon, Kenneth More and Billie Whitelaw.  It was based on the 1974 novel "Leopard in the Snow" by Anne Mather. Le wrote and co-executive produced the feature horror film "Dark Summer" (2014), directed by Paul Solet and starring Keir Gilchrist, Stella Maeve, Maestro Harrell, Grace Phipps, and Peter Stormare.  The film is "a stylized modern ghost story" and "follows the tale of a 17-year-old on house arrest for the summer.  When his mother is away on business, a horrifying incident occurs, followed by an even more terrifying presence in the house." American Sniper is a 2014 American biographical war drama film directed by Clint Eastwood and written by Jason Hall.  It is loosely based on the memoir "American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History" (2012) by Chris Kyle, with Scott McEwen and Jim DeFelice.  The film follows the life of Kyle, who became the deadliest marksman in U.S. military history with 255 kills from four tours in the Iraq War, 160 of which were officially confirmed by the Department of Defense.  While Kyle was celebrated for his military successes, his tours of duty took a heavy toll on his personal and family life.  The film was produced by Eastwood, Robert Lorenz, Andrew Lazar, Bradley Cooper, and Peter Morgan.  It stars Cooper as Kyle and Sienna Miller as his wife Taya, with Luke Grimes, Jake McDorman, Cory Hardrict, Kevin Lacz, Navid Negahban, and Keir O'Donnell in supporting roles. De Sade ("German title": Das Ausschweifende Leben des Marquis De Sade) is a 1969 American-German drama film starring Keir Dullea and Senta Berger.  It is based on the life of Donatien Alphonse François, Marquis de Sade, named Louis Alphonse Donatien in the film. Seven Years in Tibet is a 1997 American biographical war drama film based on the 1952 book of the same name written by Austrian mountaineer Heinrich Harrer on his experiences in Tibet between 1944 and 1951 during World War II, the interim period, and the Chinese People's Liberation Army's invasion of Tibet in 1950.  Directed by Jean-Jacques Annaud and starring Brad Pitt and David Thewlis, the score was composed by John Williams and features cellist Yo-Yo Ma. The Naked Hours (Italian: "Le ore nude" ) is a 1964 Italian drama film directed by Marco Vicario and starring Keir Dullea and Rossana Podestà.  It is based on the novel "Appuntamento al mare" by Alberto Moravia. Thank You for Your Service is an upcoming American biographical war drama film written and directed by Jason Hall in his directorial debut, based on the non-fiction book of the same name by David Finkel.  The film is about posttraumatic stress disorder (PTSD), depicting United States soldiers who try to adjust to civilian life after returning from Iraq.  The film is produced by DreamWorks Pictures and distributed by Universal Pictures, starring Miles Teller, Haley Bennett, Beulah Koale, Amy Schumer, and Scott Haze.  Principal photography began on February 9, 2016 in Atlanta.  It is scheduled for release on October 27, 2017. Heaven & Earth is a 1993 American biographical war drama film written and directed by Oliver Stone, and starring Tommy Lee Jones, Haing S. Ngor, Joan Chen, and Hiep Thi Le.  It is the third and final film in Stone's Vietnam War trilogy, which also includes "Platoon" (1986) and "Born on the Fourth of July" (1989). Jarhead is a 2005 American biographical war drama film based on U.S. Marine Anthony Swofford's 2003 memoir of the same name, directed by Sam Mendes, starring Jake Gyllenhaal as Swofford with Jamie Foxx, Peter Sarsgaard and Chris Cooper.  The title comes from the slang term used to refer to United States Marines. Keir O'Donnell (born 8 November 1978) is an Australian-born American actor, best known for his roles in the films "Wedding Crashers", "The Break-Up", "" and "American Sniper" as well as numerous television appearances.
Answer: Clint Eastwood