| Name: | Mark O'Brien |
| Birthday: | 07-May-1984 |
| Place of birth: | St. Johns, Newfoundland, Canada |
| Biography: | 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). |