Acting

Mark O'Brien

Born 1984

Known for Arrival, Ready or Not, Marriage Story.

21 linked movie credits shown

Born05/07/1984

Age42 years old

BirthplaceSt. Johns, Newfoundland, Canada

DepartmentActing

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).

Movie Credits

Shadow of God (2025)

As Mason Harper

Horror

The Memory Keeper (2025)

As Elizeus Carrier

Science Fiction, Thriller

Topper (2025)

As Topper

Drama

Parallel (2018)

As Josh

Science Fiction, Fantasy, Horror

The Four Horsemen (2008)

As Eric Rollins

Drama, Action, War

The Outer Threat (2026)

As Daniel Ashford

Science Fiction, Thriller

Hammer (2019)

As Chris Davis

Crime, Drama, Thriller

The Voices of Our Mother (2026)

As William

Horror

Blue Bayou (2021)

As Ace

Drama

Ready or Not (2019)

As Alex

Horror, Comedy

Seven Veils (2025)

As Paul

Drama

Anon (2018)

As Cyrus Frear

Science Fiction, Crime, Mystery, Thriller

Arrival (2016)

As Captain Marks

Drama, Science Fiction, Mystery

How It Ends (2018)

As Jeremiah

Science Fiction, Thriller, Mystery, Action, Adventure

How to Plan an Orgy in a Small Town poster

How to Plan an Orgy in a Small Town (2015)

As Bruce Buck

Drama, Comedy

Nuremberg (2025)

As Colonel John Amen

History, Drama

The Darkest Minds (2018)

As Rob Meadows

Action, Adventure, Drama

Kin (2018)

As Jake

Science Fiction, Action, Adventure, Thriller

Marriage Story (2019)

As Carter Mitchum

Drama

Bad Times at the El Royale (2018)

As Larsen Rogers

Thriller, Mystery, Crime, Drama

The One That Got Away (2008)

As Tommy Palchek

TV Movie, Romance, Drama