Mark O'Brien (born May 7, 1984) is a Canadian actor and director best known for his roles as Des Courtney in Republic of Doyle (2010โ2014) and Tom Rendon in Halt and Catch Fire (2015โ2016). 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...
