
Mark O'Brien
Born in St. Johns, Newfoundland, Canada
- Born:
- May 7, 1984 (age 41)
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).
View on IMDbCast Credits

Nuremberg
2025
As Colonel John Amen

Blue Bayou
2021
As Ace

Marriage Story
2019
As Carter Mitchum

Ready or Not
2019
As Alex Le Domas

The Front Runner
2018
As Billy Shore

Bad Times at the El Royale
2018
As Larsen Rogers

Kin
2018
As Jake

The Darkest Minds
2018
As Rob Meadows

How It Ends
2018
As Jeremiah

Anon
2018
As Cyrus Frear

Parallel
2018
As Josh

Arrival
2016
As Captain Marks

How to Plan an Orgy in a Small Town
2015
As Bruce Buck