Jack Gleeson (born 20 May 1992) is an Irish actor who has worked in television and film. He has a minor role in the film Batman Begins and received a number of outstanding reviews for his lead role in the film All Good Children, with Variety describing him as "the pic's big discovery."
Gleeson was born in Cork, Ireland. He is a student of Trinity College Dublin and a member of DU Players. As a result, Gleeson's natural speaking voice actually has a pronounced Irish accent: the upper-class, Received Pronunciation accent he adopts while playing Joffrey on-screen is a conscious part of his performance. In the Blu-ray commentary for "Lord Snow", Sophie Turner (Sansa Stark) explains that for amusement between takes, the English-accented Turner and Irish-accented Gleeson would imitate one another's accents.