Question: What character did this actor, who also played a supporting role in Sleepy Hollow, play in the final six Harry Potter films?

Context paragraphs:
Michael McCarthy (choirmaster): Michael McCarthy is Director of Music at Washington National Cathedral.  Previously, he was the founding director of the London Oratory School Schola at the London Oratory in London.  In addition to liturgical duties, the Schola recorded for the film scores of "Sleepy Hollow", "The Lord of the Rings" film trilogy, and the Harry Potter series.  McCarthy also worked with The Sixteen, the Gabrieli Consort, The Cardinall's Musick and the Monteverdi Choir.

Wrockstock: Wrockstock was a yearly music festival featuring wizard rock, music inspired by the world of Harry Potter.  Its name is a play on the music festival Woodstock.  Wrockstock was first held in 2007.  Organized by Abby Hupp, it was the first large Wizard Rock gathering of its kind that was not part of a general Harry Potter fan conference.  It took place at the YMCA summer camp near Ozark, Missouri.  The first year it was titled "WRockstock Spooktacular".  It doubled as a fundraiser for the Harry Potter Alliance, a charitable foundation run by Harry Potter fans.  Its final festival was in 2013.

Sleepy Hollow (TV series): Sleepy Hollow is an American supernatural drama television series that aired on Fox from September 16, 2013 to March 31, 2017.  The series is loosely based on the 1820 Halloween short story "The Legend of Sleepy Hollow" by Washington Irving with added concepts from "Rip Van Winkle", also by Irving.  The series is initially set in real-life Sleepy Hollow, New York, although it portrays the town as much larger than it actually is.  For the fourth and final season, the setting moved to Washington, D.C.

Sleepy Hollow (film): Sleepy Hollow is a 1999 American Gothic supernatural horror film directed by Tim Burton.  It is a film adaptation loosely inspired by the 1820 short story "The Legend of Sleepy Hollow" by Washington Irving and stars Johnny Depp and Christina Ricci, with Miranda Richardson, Michael Gambon, Casper Van Dien, and Jeffrey Jones in supporting roles.  The plot follows police constable Ichabod Crane (Depp) sent from New York City to investigate a series of murders in the village of Sleepy Hollow by a mysterious Headless Horseman.

Lego Harry Potter: Years 5–7: Lego Harry Potter: Years 5–7 is a Lego-themed action-adventure video game developed by Traveller's Tales and published by Warner Bros.  Interactive Entertainment.  Released on 11 November 2011 in North America and 18 November in Europe, the game is based on the Lego Harry Potter line and is based on the final three books and four films in the "Harry Potter" series: "Harry Potter and the Order of the Phoenix", "Harry Potter and the Half-Blood Prince", "Harry Potter and the Deathly Hallows – Part 1", and "Harry Potter and the Deathly Hallows – Part 2".  The game was released for the PlayStation 3, Xbox 360, PlayStation Portable, PlayStation Vita, Wii, Nintendo DS, Nintendo 3DS, Microsoft Windows, iOS and Android.  The first trailer of three trailers was released 6 October 2011, and the demo was released on 1 November.  The game was released on Steam on 5 January 2012.  The OS X version of the game was released by Feral Interactive on 7 March 2012.  The game was released for the PlayStation 4 on October 21, 2016, as part of the "Lego Harry Potter Collection", which bundles the game with its predecessor, "".

Michael Gambon: Sir Michael John Gambon {'1': ", '2': ", '3': ", '4': "} (born 19 October 1940) is an Irish-born English actor who has worked in theatre, television and film.  Gambon has played the eponymous mystery writer protagonist in the BBC television serial "The Singing Detective", Jules Maigret in the 1990s ITV serial "Maigret", and Professor Albus Dumbledore in the final six "Harry Potter" films after the death of previous actor Richard Harris.  He has won four BAFTA TV Awards and three Olivier Awards.

MuggleNet: MuggleNet is a "Harry Potter" fansite founded by Emerson Spartz.  The site is composed of news, editorials, and synopses of the "Harry Potter" books and films, an encyclopedia of the books, an IRC network, in which the fans of "Harry Potter" can discuss predictions and share thoughts, a discussion forum, and media such as screenshots, theatrical trailers, and book covers.  There is also a fan fiction section, a weekly caption contest, and other occasional contests and polls.  On August 9, 2005, it launched a podcast, dubbed "MuggleCast", as well as its own line of clothing, toy wands, and other merchandise.  In 2006, MuggleNet released a best-selling reference book on "Harry Potter and the Deathly Hallows", the final book in the series.  As of 2008, MuggleNet is owned by Spartz, Inc., an Indiana corporation registered by Emerson Spartz in 2007.  On May 29, 2010, MuggleNet 2.0, an updated version of the site, went live.  On April 1, 2014, MuggleNet 3.0 was launched to the public.

Lego Harry Potter: Lego "Harry Potter" is a Lego theme based on the films of the "Harry Potter" series.  Lego models of important scenes, vehicles and characters were made for the first six films and all the books released.  The first sets appeared in 2001, to coincide with the release of the first film "Harry Potter and the Philosopher's Stone" (Harry Potter and the Sorcerer's Stone in the United States).  Subsequent sets were released alongside the new films, until Harry Potter and the Order of the Phoenix.  The line then went dormant for three years.  It is unknown if the theme will again be revived to coincide with future installations in the Harry Potter franchise, such as the film Fantastic Beasts and Where to Find Them.

Afshin Zinoori: Afshin Zinoori (افشين زی‌نوری) (born April 30, 1976), is an Iranian actor who is known for Persian voice-dubbing foreign films and television programs.  He was originally born from Tehran.  He is known for dubbing over Elijah Wood's role as Frodo Baggins from "The Lord of the Rings" film trilogy and has also dubbed over some of Leonardo DiCaprio and Matt Damon's voice roles in films they starred in.  He has also dubbed over Daniel Radcliffe's role as Harry Potter, from the Harry Potter films 3-5.

List of Sleepy Hollow episodes: "Sleepy Hollow" is an American supernatural drama television series that premiered on Fox on September 16, 2013 and ended on March 31, 2017.  The series is considered a "modern-day retelling" of the 1820 short story "The Legend of Sleepy Hollow" by Washington Irving with added concepts from "Rip Van Winkle", also by Irving.  The series was renewed for a fourth and final season which premiered on January 6, 2017.

Supporting paragraphs: Sleepy Hollow (film) Michael Gambon
Answer: Professor Albus Dumbledore