Mark O'Brien

Acting

Born: May 7, 1984 (age 42) · St. Johns, Newfoundland, Canada

Plays: Colonel John Amen in Nuremberg (2025)

Full filmography & movie ratings on Popcorn Jury →

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About Mark O'Brien

Mark O'Brien (born May 7th, 1984) is a Canadian actor and director. He is best known for playing the role of Des Courtney in Republic of Doyle (2010) and Tom Rendon in Halt and Catch Fire (2014).