Mark O'Brien
- Known for
- Acting
- Gender
- Male
- Born
- May 7, 1984
- Age
- 42
- From
- St. Johns, Newfoundland, Canada
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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