Brendan Gleeson was born on 29th March 1955 who is an Irish actor and is best known for his acts in Gangs of New York, 28 days Later, Troy, and the Harry Potter movies. He was born in Dublin and attended St. Josephs CBS where he got his second level education. He did training for his acting profession and then later he returned to Ireland where he worked as an secondary level school teacher at Catholic Belcamp College which was situated in Dublin. The school was later shut down in 2004. He was working concurrently as an actor while teaching, doing semi qualified and qualified productions in Dublin and adjacent areas. He left the teaching occupation to consign full-time to acting in 1991. He started his filming career by the age of 34.

 He first came to his acting status in Ireland for his role as Michael Collins in The Treaty, a television film show on RTÉ One, for which he won a Jacob's Award in. He got the award in 1992. He has acted in such pictures as Braveheart, I Went Down, Michael Collins, Gangs of New York, Cold Mountain, 28 Days Later, Troy Kingdom of Heaven, Lake Placid, A.I. Artificial Intelligence, Mission: Impossible II, and The Village. He won vital praise for his performance as Irish gangster Martin Cahill in John Boorman's 1998 film The General. He gave voice to Channel 4 animated series Wilde Stories for the character Hugh the Miller in 2003. Gleeson presented the voice of Abbot Cellach in The Secret of Kells, an animated movie co-directed by Tomm Moore and Nora Twomey of Cartoon Saloon which debuted  at the Jameson Dublin International Film Festival. The movie premiered in 2009. While Gleeson signified Irish statesman Michael Collins in The Treaty, he soon after portrayed Collins' close associate Liam Tobin in the film Michael Collins with Liam Neeson intriguing the position of Collins. Gleeson later on  went on to depict Winston Churchill in Into the Storm. Gleeson won an Emmy Award for his presentation. Gleeson co-operated  Hogwarts professor Mad-Eye Moody in the fourth, fifth and seventh Harry Potter franchise. His son Domhnall gave the role of  Bill Weasley in the seventh film. Gleeson will be making his directorial first appearance in a film adaptation of Flann O'Brien's novel At Swim Two Birds. The Irish production company Parallel Pictures will create the film with a financial plan of $11 million. Colin Farrell, Gabriel Byrne, and Cillian Murphy have been connected to star in the film, which was initially set to make public in 2010. In October 2009, on the other hand, Gleeson spoke about the concern that the Irish Film Board's budget may be decreased given the position of the Irish market and that  At Swim Two Birds might go down. Gleeson verified in July 2011, that he has locked funding for the plan. He explained the marks of the script as twisted, saying that it had used fourteen drafts so far. In July 2012, he began making The Grand Seduction with Taylor Kitsch, a remake of Jean-François Pouliot's French-Canadian La Grande Seduction directed by Don McKellar. The movie was released in 2003. He is also a good musician as he is a good fiddle player. He played the instrument for his role in Cold Mountain and also in Michael Collins

He got married to Mary since 1982. The couple got four sons who are Domhnall. Fergus, Briain and Ruairi. His sons Domhnall and Briain are also actors who support their father. He also has a brother who is a singer and is well known in An Goilin traditional singers club. His brother is Barry Gleeson. Brendan has got fluency in Irish language and is also an active advocate for the promotion of the Irish language.