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Mark O'Brien, born on May 7, 1984, is a Canadian actor and director whose career has been marked by nuanced performances in both television and film. He gained recognition for his portrayal of Des Courtney in the crime drama series Republic of Doyle, a role that showcased his ability to convey complex characters with quiet intensity. O'Brien further solidified his reputation as a compelling actor with his turn as Tom Rendon in the tech-industry series Halt and Catch Fire, where his portrayal added depth to the narrative's exploration of innovation and personal ambition.
The roles that explain the career.
27 credits across 5 departments.
| Year | Title | Role | Type |
|---|---|---|---|
| 2026 | The Voices of Our Mother | William | Film |
| 2026 | The Outer Threat | Film | |
| 2026 | The Voices of Our Mother | Director | Film |
| 2026 | The Voices of Our Mother | Writer | Film |
| 2025 | Shadow of God | Mason Harper | Film |
| 2025 | The Memory Keeper | Elizeus Carrier | Film |
| 2025 | The Copenhagen Test | Edmund Cobb | TV |
| 2025 | Nuremberg | Colonel John Amen | Film |
| 2019 | Goalie | Terry Sawchuk | Film |
| 2019 | Ready or Not | Alex | Film |
| 2019 | Marriage Story | Carter Mitchum | Film |
| 2019 | Goalie | Executive Producer | Film |
| 2018 | Anon | Cyrus Frear | Film |
| 2018 | The Darkest Minds | Rob Meadows | Film |
| 2018 | Kin | Jake | TV |
| 2018 | How It Ends | Jeremiah | Film |
| 2017 | The Last Tycoon | Max Miner | TV |
| 2016 | Arrival | Captain Marks | Film |
| 2012 | Beat Down | Michael | Film |
| 2010 | Republic of Doyle | Des Courtney | TV |
| 2010 | Grown Up Movie Star | Will | Film |
| 2008 | The One That Got Away | Tommy Palchek | Film |
| 2008 | The Four Horsemen | Eric Rollins | Film |
| Little One | Film | ||
| Good in the Room | Charlie | Film | |
| Good in the Room | Writer | Film | |
| Good in the Room | Executive Producer | Film |
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