Profile photo of Mark O'Brien

Mark O'Brien

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).

Filmography

2025
Nuremberg

as Colonel John Amen

Movie
2019
Ready or Not

as Alex Le Domas

Movie
2016
Arrival

as Captain Marks

Movie
2018
How It Ends

as Jeremiah

Movie
2015
How to Plan an Orgy in a Small Town

as Bruce Buck

Movie
2025
The Copenhagen Test

as Cobb

TV Show