Mark O'Brien is a Canadian actor and director best known for his roles as Des Courtney in Republic of Doyle and Tom Rendon in Halt and Catch Fire. He won the Canadian Screen Award for Best Actor at the 8th Canadian Screen Awards for his performance as Terry Sawchuk in the biographical drama film Goalie. He is an English major with a Bachelor of Arts from Memorial University of Newfoundland. His mother was a nurse and his father a truck driver. Mark also has three older sisters.
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