Acting
Mark O'Brien
St. Johns, Newfoundland, CanadaBorn 1984 (41 years old)
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).
31
Films
13
TV Shows
4
Crew Credits
Known For
44 Credits
The Kelly Clarkson Show
as Self
2019
Nuremberg
as Colonel John Amen
2025
Warehouse 13
as Jerry Hoffler
2009
Hannibal
as Randall Tier
2013
Arrival
as Captain Marks
2016
Killjoys
as Grayson Hicks
2015
Halt and Catch Fire
as Tom Rendon
2014
Your Honor
as Father Jay
2020
The Copenhagen Test
as Edmund Cobb
2025
Perry Mason
as Thomas Milligan
2020
Republic of Doyle
as Des Courtney
2010
City on a Hill
as Jimmy Ryan
2019
