Frequently plays wise, experienced men who act as mentors and father figures to the lead characters.
He is a fine fiddle player and can be seen playing it in Michael Collins (1996) and also in Cold Mountain (2003).
He has four sons from his marriage to Mary: Domhnall, Fergus, Brian and Rory.
He was a teacher for 10 years before becoming an actor
Joined the Royal Shakespeare Company (RSC) in Stratford Upon Avon, England, in the late eighties for two seasons where his credits included King Lear and King Richard II.
Attended the Royal Academy of Dramatic Art in London, England.
Participated in the Dublin Shakespeare Theatre Festival the during mid-eighties.
Plays a professor of Defense Against the Dark Arts in Harry Potter and the Goblet of Fire (2005), Harry Potter and the Order of the Phoenix (2007), and presumably any subsequent films in which his character, Mad-Eye Moody, appears. This makes him the first, and to date, only actor to play a Hogwarts professor who has himself been employed as a teacher.
He started acting at the age of 34.
Taught Maths at St. Joseph's Secondary school in Fairview, Dublin.