Mark O'Brien

  • Career: Actor
  • Date of birth: 7th of May 1984
  • Place of birth: St. Johns, Newfoundland, Canada
  • Age: 40
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).

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