- Despite playing the monstrous Joffrey on Game of Thrones (2011), all of his co-stars have described him as one of the nicest and friendliest actors they have ever worked with.
- He based his performance as Joffrey in Game Of Thrones (2011- ) on Joaquin Phoenix's performance in Gladiator (2000).
- Doesn't like to swear and usually avoids it in rehearsal and does it in the take.
- Has said he doesn't plan to continue acting after finishing Game of Thrones (2011).
- Gleeson is the founder and artistic director of Collapsing Horse Theatre Company, which is based in Dublin.
- Is a student at Trinity College in Dublin.
- Is a co-founder of Collapsing Horse, a production company. "Monster/Clock: A Play on Time" was the recent puppet production performed at the Smock Alley Theatre in Dublin, Spring, 2012. He was the puppeteer for the lead character, Toby.
- He went to Gonzaga College, a private school in Dublin from 2004-2010.
- Is a member of the DU Players.
- Croatia, Dubrovnik: Filming Game of Thrones (April 2012)
- Has a sister named Hannah.
- Dublin, Ireland: Studying (August 2012)
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