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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).
Mark O'Brien in the CAST
as Mark
as Josh
as Alex Le Domas
as Aaron Smith
Mark O'Brien in the CREW
Executive Producer,Director,Writer