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).
Known For
Complete Filmography
Nuremberg
2025
as Col. John Amen
American psychiatrist Douglas Kelley, tasked with determining whether Nazi prisoners are fit to stand trial for their war crimes, finds himself in a c...
Shadow of God
2025
as Mason Harper
While performing an unauthorized exorcism on his father, an elite exorcist suspects the entity he's doing battle with might be a holy being – perhaps ...
Seven Veils
2025
as Paul
Jeanine, an earnest theatre director, has been given the task of remounting her former mentor’s most famous work, the opera Salome. Haunted by dark an...
Topper
2025
as Topper
Once a top rising comedian, Topper quickly falls from grace and finds himself struggling to get by in the cutthroat comedy scene of LA. His inability ...
Blue Bayou
2021
as Ace
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 discove...
The Righteous
2021
as Aaron Smith
A burdened man feels the wrath of a vengeful God after he and his wife are visited by a mysterious stranger.
The Righteous
2021
Director, Writer, Executive Producer
A burdened man feels the wrath of a vengeful God after he and his wife are visited by a mysterious stranger.
Hammer
2019
as Chris Davis
A father faces a personal crisis when he discovers his estranged son fleeing a botched drug deal. The two men embark on a violent odyssey that grapple...
Marriage Story
2019
as Carter Mitchum
A stage director and an actress struggle through a grueling, coast-to-coast divorce that pushes them to their personal extremes.
Ready or Not
2019
as Alex Le Domas
A young bride's wedding night turns into her worst nightmare when her ridiculously rich in-laws force her to play a gruesome game of hide-and-seek.
Goalie
2019
as Terry Sawchuk
The life of a professional hockey player was not always a glamorous one. For legendary goaltender Terry Sawchuk, each save means one more gash to his ...
Goalie
2019
Executive Producer
The life of a professional hockey player was not always a glamorous one. For legendary goaltender Terry Sawchuk, each save means one more gash to his ...
State Like Sleep
2019
as Darren
Following the death of her husband, Katherine travels to Brussels, where a few loose ends become a whole web of secrets as she untangles her late spou...
The Front Runner
2018
as Billy Shore
Gary Hart, former Senator of Colorado, becomes the front-runner for the Democratic presidential nomination in 1987. Hart's intelligence, charisma and ...
Bad Times at the El Royale
2018
as Larsen Rogers
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 ni...
Kin
2018
as Jake
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 ...
The Darkest Minds
2018
as Rob Meadows
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 h...
How It Ends
2018
as Jeremiah
A desperate father tries to return home to his pregnant wife after a mysterious apocalyptic event turns everything to chaos.
Anon
2018
as Cyrus Frear
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 t...
Parallel
2018
as Josh
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 ...
Arrival
2016
as Captain Marks
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 ...
Wanderer
2016
as Eric
A conversation over dinner, between a married couple and a weary traveller, leads to unexpected revelations
Wanderer
2016
Director, Producer
A conversation over dinner, between a married couple and a weary traveller, leads to unexpected revelations
The Dark Stranger
2016
as Mark
Haunted by a terrifying spirit out of her graphic novel, a young artist struggles to overcome her psychosis before it destroys her.
How to Plan an Orgy in a Small Town
2015
as Bruce Buck
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...
End of Days, Inc.
2015
as Jason
A group of laid-off workers bribed into working one last night discover that processing the last of their "inventory" will lead to cataclysmic consequ...
Dennis
2015
as Dennis
Dennis Smarten leads a simple life. He has a job in a plastic bag factory, an apartment in his sister's basement and a predisposition for psychosis.
Dennis
2015
Producer
Dennis Smarten leads a simple life. He has a job in a plastic bag factory, an apartment in his sister's basement and a predisposition for psychosis.
Sweetieface
2013
as Sam
Sam and Grace meet up in a deserted bar, seeing each other for the first time in long while. They have a lot to say, except their true feelings for on...
Sweetieface
2013
Director, Producer, Editor
Sam and Grace meet up in a deserted bar, seeing each other for the first time in long while. They have a lot to say, except their true feelings for on...
Beat Down
2012
as Michael
Beat Down is an irreverent comedy about wrestling, family and following your dreams no matter how painful that can sometimes be. Fran Whiteway (Marth...
Kathy
2011
Director
Kathy is a portrait of the most fascinating creature of all: the adult in training, the object of everyone's first affection, the teenage girl.
Snarbuckled
2010
as Jacob O'Higgins
An itinerant cook survives a shipwreck, paddles himself to an island in a stock pot, and finds himself on a surreal journey through his past to discov...
Brad
2010
as Brad
A day in the life of a young man starting a career in in-office motivational speaking.
Brad
2010
Producer, Editor
A day in the life of a young man starting a career in in-office motivational speaking.
Mum's the Word
2009
as Curtis
A group of youngsters discover that Mr. Templeton has 40 grand hidden in his home. They figure they can get their hands on the cash by masking themsel...
Grown Up Movie Star
2009
as Will
The story of Ruby, 13, determined to grow up fast after her mother runs away to become a movie star, leaving Ruby with her hopelessly rural father.
Quiet at Dawn
2009
as Watts
A WW1 soldier has to watch over another soldier whom he falsely accused of desertion and whom will executed at dawn for cowardice.
Cut from the Same Cloth
2009
as Jack Cochrane
In discovering the secret past of an old St. John's neighborhood, a family learns that love can lead down an uncharted road that is best followed with...
Heartless Disappearance Into Labrador Seas
2008
as Charlie
When a marriage is threatened by a long excursion for work, domestic trouble is buffeted by family and friends.
Epilogue
2008
as Henry
The morning after a drunken romp, Henry and Evelyn reveal that they have shared more than just a simple night.
The One That Got Away
2008
as Tommy Palchek
Joanna, recently divorced, decided to return with her daughter to the town where she was born. There, she confronts the memories of the past when he m...
The Four Horsemen
2008
as Eric Rollins
Four high school football stars enlist in the Marines and head off to fight in the war in Iraq. When one of them is killed and another wounded, they r...
The Voices of Our Mother
N/A
as William
When a family matriarch falls seriously ill, relatives gather and discover their shared ancestral ties bind them in unexpected ways.
The Embers and the Stars
N/A
An astrophysicist, after making an extraterrestrial discovery, is forced to flee with his family from their home and is chased through the countryside...
Falsehood
N/A
as Elizeus Carrier
In a dystopian future where all of humanity's memories have become government-regulated transactional products, mankind's crown-jewel memory is stolen...
Better People
N/A
as John
Committing to love at first sight can be complicated.
The Voices of Our Mother
N/A
Director, Writer
When a family matriarch falls seriously ill, relatives gather and discover their shared ancestral ties bind them in unexpected ways.
Better People
N/A
Director, Writer, Editor
Committing to love at first sight can be complicated.