Question: The English actor best known as Harry Potter starred in Horns which was directed by who?

Context paragraphs:
Daniel Radcliffe: Daniel Jacob Radcliffe (born 23 July 1989) is an English actor best known for his role as Harry Potter in the film series of the same name.  He made his acting debut at 10 years of age in BBC One's 1999 television film "David Copperfield", followed by his cinematic debut in 2001's "The Tailor of Panama".  At age 11, he was cast as Harry Potter in the first "Harry Potter" film, and starred in the series for 10 years until the release of the eighth and final film in 2011.

Tom Felton: Thomas Andrew Felton (born September 22, 1987) is an English actor.  Felton began appearing in commercials when he was eight years old for companies such as Commercial Union and Barclaycard.  He made his screen debut in the role of Peagreen Clock in "The Borrowers" (1997) and he portrayed Louis T. Leonowens in "Anna and the King" (1999).  He rose to prominence for his role as Draco Malfoy in the film adaptions of the best-selling "Harry Potter" fantasy novels by J.K. Rowling.  His performances in "Harry Potter and the Half-Blood Prince" and "Harry Potter and the Deathly Hallows – Part 1" won him two consecutive MTV Movie Awards for Best Villain in 2010 and 2011.

Rob Knox: Robert Arthur Knox (21 August 1989 – 24 May 2008) was an English actor who portrayed the character of Marcus Belby in the film "Harry Potter and the Half-Blood Prince" (2009), and had signed to appear in the planned film "Harry Potter and the Deathly Hallows" (2010).

Rupert Grint: Rupert Alexander Lloyd Grint (born 24 August 1988) is an English actor and producer.  He rose to prominence playing Ron Weasley, one of the three main characters in the "Harry Potter" film series.  Grint was cast as Ron at the age of 11, having previously acted only in school plays and at his local theatre group.  From 2001 to 2011, he starred in all eight "Harry Potter" films alongside Daniel Radcliffe playing as Harry Potter and Emma Watson playing as Hermione Granger.

Harry Potter in translation: The "Harry Potter" series of fantasy novels by J. K. Rowling have become some of the most widely read works of children's literature in history, with readers of all ages and in many countries.  In April 2011 worldwide sales of Harry Potter books were estimated to be about 450 million copies.  Oddly enough, it has been difficult to accurately determine with any degree of certainty exactly how many languages Harry Potter has been translated into.  As best as can be determined (as of 2017), The Philosopher's Stone has been officially translated from the original English into 73 other languages.  A 74th language, Scots, was announced on 2017-06-28 and it is expected to be available in October, 2017.  Both Bloomsbury's and J.K. Rowling's sites have recently stated that the books have been translated into 79 languages (80 with the 2017-06-28 announcement of Scots); however, it has been argued that number actually represents the number of authorized translations (of The Philosopher's Stone) plus the original English.  The number of authorized translations is not equal to the number of languages because there have been multiple authorized translations into the same language.  Specifically, there have been two separate translations into each of: Mandarin Chinese, Portuguese, Romanian, Russian and Turkish (5 languages).  English is often included in the list of translations even though technically it should not be (indeed, it is why our list here counts up to 74).  Thus: 79 − English − 5 double-translations = 73.  It is also worthwhile to emphasize that not all seven books are have been translated into these 73 languages.

Hero Fiennes-Tiffin: Hero Beauregard Fiennes-Tiffin (born 6 November 1997) is an English actor best known for his role as the 11-year-old Tom Riddle, the young version of antagonist Lord Voldemort (played in the films by his uncle, Ralph Fiennes), in "Harry Potter and the Half Blood Prince", the sixth installment of the "Harry Potter" films.  He also played the role of "younger Charlie" in the war based film "Private Peaceful".

Sam Clemmett: Sam Clemmett is a British actor.  Born in Brundall, Norfolk, Clemmett began his acting career in 2013.  He is known for being cast as Albus Potter in 2015 for the British play Harry Potter and the Cursed Child.  His performance in the play has made him popular with Harry Potter fans, as well as the creator of Harry Potter, J.K. Rowling.  Rowling stated that, "There's much I could say about Sam-as-Albus, but we'd be into spoiler territory so quickly I'll just say we couldn't have cast better."  He played the role in the West End, until late-Spring 2017.

Horns (film): Horns is a 2013 American dark fantasy horror film directed by Alexandre Aja, loosely based on Joe Hill's novel of the same name.  Daniel Radcliffe stars as a man who is accused of raping and murdering his girlfriend (Juno Temple) and uses his newly discovered paranormal abilities to uncover the real killer.

Sara Bennett: Sara Bennett is a British visual effects artist.  Best known for her works in "Harry Potter and the Chamber of Secrets" (2002), "Harry Potter and the Prisoner of Azkaban" (2004), "Harry Potter and the Goblet of Fire" (2005), "Doctor Who" (2005), "Merlin" (2008), "Jonathan Strange & Mr Norrell" (2009), "Skellig" (2009), "The Martian" (2015) and "Ex Machina" (2015).

Harper Marshall: Harper Page Marshall is an English actress.  She is known for her role as Hermione Granger in the video games of "Harry Potter and the Prisoner of Azkaban", "Harry Potter and the Goblet of Fire" and "Harry Potter and the Order of the Phoenix".  She also provided the voice for "".

Supporting paragraphs: Horns (film) Daniel Radcliffe
Answer: Alexandre Aja