7.6
Movie
Acting
Mark O'Brien
- Born
- (age 42)
- Birthplace
- St. Johns, Newfoundland, Canada
- Credits
- 59 titles
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).
Signature work
Known For
7.6
Movie
7.7
Movie
Marriage Story
7.1
Movie
Ready or Not
6.8
Movie
Bad Times at the El Royale
8.3
TV
Hannibal
7.0
Movie
The Darkest Minds
5.3
Movie
How It Ends
6.0
Movie
Anon
8.0
TV
Your Honor
7.6
Movie
Nuremberg
6.1
Movie
Kin
7.7
TV
Warehouse 13
7.9
TV
Halt and Catch Fire
6.9
TV
Killjoys
7.2
TV
Perry Mason
5.9
Movie
The Front Runner
7.4
Movie
Blue Bayou
7.3
TV
City on a Hill
Acting credits 57
| Year | Title | Role |
|---|---|---|
| TBA | Better People Film | John |
| TBA | Nice People Film | |
| TBA | Good in the Room Film | Charlie |
| TBA | Little One Film | |
| TBA | Soma Film | Paul |
| 2026 | The Outer Threat Film | Daniel Ashford |
| 2026 | The Voices of Our Mother Film | William |
| 2025 | The Copenhagen Test TV | Edmund Cobb (8 ep) |
| 2025 | Nuremberg Film | Colonel John Amen |
| 2025 | The Memory Keeper Film | Elizeus Carrier |
| 2025 | Shadow of God Film | Mason Harper |
| 2025 | Seven Veils Film | Paul |
| 2025 | Topper Film | Topper |
| 2024 | The Sticky TV | Charlie (1 ep) |
| 2022 | 61st Street TV | Officer Logan (8 ep) |
| 2021 | Blue Bayou Film | Ace |
| 2021 | The Righteous Film | Aaron Smith |
| 2020 | Your Honor TV | Father Jay (3 ep) |
| 2020 | Perry Mason TV | Thomas Milligan (7 ep) |
| 2019 | Hammer Film | Chris Davis |
| 2019 | Marriage Story Film | Carter Mitchum |
| 2019 | The Kelly Clarkson Show TV | Self (1 ep) |
| 2019 | Ready or Not Film | Alex |
| 2019 | City on a Hill TV | Jimmy Ryan (14 ep) |
| 2019 | Goalie Film | Terry Sawchuk |
| 2019 | State Like Sleep Film | Darren |
| 2018 | The Front Runner Film | Billy Shore |
| 2018 | Bad Times at the El Royale Film | Larsen Rogers |
| 2018 | Kin Film | Jake |
| 2018 | The Darkest Minds Film | Rob Meadows |
| 2018 | How It Ends Film | Jeremiah |
| 2018 | Anon Film | Cyrus Frear |
| 2018 | Parallel Film | Josh |
| 2017 | The Last Tycoon TV | Max Miner (9 ep) |
| 2016 | Arrival Film | Captain Marks |
| 2016 | Wanderer Film | Eric |
| 2016 | The Dark Stranger Film | Mark |
| 2015 | How to Plan an Orgy in a Small Town Film | Bruce Buck |
| 2015 | Killjoys TV | Grayson Hicks (1 ep) |
| 2015 | End of Days, Inc. Film | Jason |
| 2015 | Dennis Film | Dennis |
| 2014 | Halt and Catch Fire TV | Tom Rendon (15 ep) |
| 2013 | Hannibal TV | Randall Tier (2 ep) |
| 2013 | Sweetieface Film | Sam |
| 2012 | Beat Down Film | Michael |
| 2010 | Snarbuckled Film | Jacob O'Higgins |
| 2010 | Brad Film | Brad |
| 2010 | Grown Up Movie Star Film | Will |
| 2010 | Republic of Doyle TV | Des Courtney (77 ep) |
| 2009 | Mum's the Word Film | Curtis |
| 2009 | Quiet at Dawn Film | Watts |
| 2009 | Warehouse 13 TV | Jerry Hoffler (1 ep) |
| 2009 | Cut from the Same Cloth Film | Jack Cochrane |
| 2008 | Heartless Disappearance Into Labrador Seas Film | Charlie |
| 2008 | Epilogue Film | Henry |
| 2008 | The One That Got Away Film | Tommy Palchek |
| 2008 | The Four Horsemen Film | Eric Rollins |
Crew credits 12
| Year | Title | Job |
|---|---|---|
| TBA | Better People Film | Director, Writer, Editor |
| TBA | Nice People Film | Director |
| TBA | Good in the Room Film | Writer, Executive Producer |
| 2026 | The Voices of Our Mother Film | Director, Writer |
| 2021 | The Righteous Film | Director, Writer, Executive Producer |
| 2019 | Goalie Film | Executive Producer |
| 2016 | Wanderer Film | Director, Producer |
| 2015 | Dennis Film | Producer |
| 2013 | Sweetieface Film | Director, Producer, Editor |
| 2011 | Kathy Film | Director |
| 2010 | Brad Film | Producer, Editor |
| 2008 | Pretty Girls Film | Director, Writer, Editor, Cinematography |