Mark O'Brien

Acting

Mark O'Brien (born May 7, 1984) is a Canadian actor and director. He is best known for playing the role of Des Courtney in Republic of Doyle and Tom Rendon in Halt and Catch Fire.

Ratings

Acting: 851 rating

Filmography

Acting

15 titles

52MovieNerd Score

Nuremberg

Movie2025

In postwar Germany, an American psychiatrist must determine whether Nazi prisoners are fit to go on trial for war crimes, and finds himself in a complex battle of intellect and ethics with Hermann Göring, Hitler's right-hand man.

Blue Bayou

Movie2021

As a Korean-American man raised in the Louisiana bayou works hard to make a life for his family, he must confront the ghosts of his past as he discovers that he could be deported from the only country he has ever called home.

Marriage Story

Movie2019

A stage director and an actress struggle through a grueling, coast-to-coast divorce that pushes them to their personal extremes.

Ready or Not

Movie2019

A bride's wedding night takes a sinister turn when her eccentric new in-laws force her to take part in a terrifying game.

Anon

Movie2018

Set in a near-future world where there is no privacy, ignorance or anonymity, our private memories are recorded and crime almost ceases to exist. In trying to solve a series of unsolved murders, Sal Frieland stumbles onto a young woman who appears to have subverted the system and disappeared. She has no identity, no history and no record. Sal realizes it may not be the end of crime but the beginning. Known only as 'The Girl', Sal must find her before he becomes the next victim.

Bad Times at the El Royale

Movie2018

Lake Tahoe, 1969. Seven strangers, each one with a secret to bury, meet at El Royale, a decadent motel with a dark past. In the course of a fateful night, everyone will have one last shot at redemption.

How It Ends

Movie2018

A desperate father tries to return home to his pregnant wife after a mysterious apocalyptic event turns everything to chaos.

Kin

Movie2018

A young boy finds a powerful otherworldly weapon, which he uses to save his older adoptive brother from a crew of thugs. Before long, the two of them are also pursued by federal agents and mysterious mercenaries aiming to reclaim their asset.

Parallel

Movie2018

A group of friends stumble upon a mirror that serves as a portal to a "multiverse", but soon discover that importing knowledge from the other side in order to better their lives brings increasingly dangerous consequences.

The Darkest Minds

Movie2018

After a disease kills 98% of America's children, the surviving 2% develop superpowers and are placed in internment camps. A 16-year-old girl escapes her camp and joins a group of other teens on the run from the government.

The Front Runner

Movie2018

Gary Hart, former Senator of Colorado, becomes the front-runner for the Democratic presidential nomination in 1987. Hart's intelligence, charisma and idealism makes him popular with young voters, leaving him with a seemingly clear path to the White House. All that comes crashing down when allegations of an extramarital affair surface in the media, forcing the candidate to address a scandal that threatens to derail his campaign and personal life.

The Last Tycoon

TV2017

From F. Scott Fitzgerald's last work, The Last Tycoon follows Monroe Stahr, Hollywood's Golden Boy as he battles father figure and boss Pat Brady for the soul of their studio. In a world darkened by the Depression and the growing influence of Hitler's Germany, The Last Tycoon illuminates the passions, violence and towering ambition of 1930s Hollywood.

Arrival

Movie2016

Taking place after alien crafts land around the world, an expert linguist is recruited by the military to determine whether they come in peace or are a threat.

How to Plan an Orgy in a Small Town

Movie2015

In high school Cassie Cranston was slut-shamed out of the wholesome and repressed town of Beaver’s Ridge following a humiliating attempt at losing her virginity. Now, years later, a big city sex columnist, Cassie returns home to bury her mother and finds a chance for revenge when her prudish childhood nemesis insists she helps her old friends plan an orgy.

Republic of Doyle

TV2010

Jake Doyle and his ex-cop father, Malachy, run a Newfoundland detective agency. Their rugged seaside town never lacks for intriguing cases, and the Doyles don't always land on the right side of the law.