| Birth Day | May 7, 1984 |
| Birth Place | St. John's, Canada |
| Mark O'Brien age | 39 YEARS OLD |
| Birth Sign | Taurus |
Canadian actor who has won acclaim for television roles like Des Courtney on Republic of Doyle and Tom Rendon on Halt and Catch Fire.
He earned a Bachelor of Arts from the Memorial University of Newfoundland.
He was nominated for Canadian Comedy Awards for his performance on Republic of Doyle in 2011 and 2014.
He married Actress Georgina Reilly in 2013. He has three older sisters.
He has co-starred with Lee Pace on AMC's Halt and Catch Fire.
