Mark O'Brien (born May 7, 1984) is a Canadian actor and director. He is best known for playing the roles of Des Courtney in Republic of Doyle and Tom Rendon in Halt and Catch Fire. O'Brien married fellow CBC network star Georgina Reilly on January 6, 2013, after having met on the set of Republic of Doyle in 2011.
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https://en.wikipedia.org/wiki/Mark_O%27Brien_(actor)