
Acting
Born May 7, 1984 · St. Johns, Newfoundland, Canada
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).

Nuremberg
2025

Falsehood
2025

Shadow of God
2025

Seven Veils
2025

Topper
2025

Blue Bayou
2021

The Righteous
2021

Hammer
2019

Marriage Story
2019

Ready or Not
2019

Goalie
2019

State Like Sleep
2019

The Front Runner
2018

Bad Times at the El Royale
2018

Kin
2018

The Darkest Minds
2018

How It Ends
2018

Anon
2018

Parallel
2018

Arrival
2016

Wanderer
2016

The Dark Stranger
2016

How to Plan an Orgy in a Small Town
2015

End of Days, Inc.
2015

Dennis
2015
Sweetieface
2013

Beat Down
2012

Snarbuckled
2010
Brad
2010
Mum's the Word
2009

Grown Up Movie Star
2009
Quiet at Dawn
2009
Cut from the Same Cloth
2009

Heartless Disappearance Into Labrador Seas
2008
Epilogue
2008

The One That Got Away
2008

The Four Horsemen
2008