Mark O'Brien

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).

Movies & TV Shows

1. Arrival (2016) — Captain Marks
2. Marriage Story (2019) — Carter Mitchum
3. Ready or Not (2019) — Alex
4. Bad Times at the El Royale (2018) — Larsen Rogers
5. Hannibal (2013) — Randall Tier
6. The Darkest Minds (2018) — Rob Meadows
7. How It Ends (2018) — Jeremiah
8. Anon (2018) — Cyrus Frear
9. Your Honor (2020) — Father Jay
10. Nuremberg (2025) — Colonel John Amen
11. Kin (2018) — Jake
12. Warehouse 13 (2009) — Jerry Hoffler
13. Halt and Catch Fire (2014) — Tom Rendon
14. Killjoys (2015) — Grayson Hicks
15. The Front Runner (2018) — Billy Shore
16. Perry Mason (2020) — Thomas Milligan
17. Blue Bayou (2021) — Ace
18. City on a Hill (2019) — Jimmy Ryan
19. Parallel (2018) — Josh
20. How to Plan an Orgy in a Small Town (2015) — Bruce Buck
21. The Copenhagen Test (2025) — Edmund Cobb
22. The Sticky (2024) — Charlie
23. The Kelly Clarkson Show (2019) — Self
24. The Last Tycoon (2017) — Max Miner
25. Seven Veils (2025) — Paul
26. Shadow of God (2025) — Mason Harper
27. Republic of Doyle (2010) — Des Courtney
28. State Like Sleep (2019) — Darren
29. The Dark Stranger (2016) — Mark
30. Hammer (2019) — Chris Davis
31. 61st Street (2022) — Officer Logan
32. End of Days, Inc. (2015) — Jason
33. The Righteous (2021) — Aaron Smith
34. The Four Horsemen (2008) — Eric Rollins
35. Grown Up Movie Star (2010) — Will
36. The Outer Threat (2026)
37. Goalie (2019) — Terry Sawchuk
38. The Voices of Our Mother (2026) — William
39. Topper (2025) — Topper
40. The One That Got Away (2008) — Tommy Palchek

Directed

1. The Righteous (2021) — Director
2. The Voices of Our Mother (2026) — Director
3. Wanderer (2016) — Director
4. Kathy (2011) — Director
5. Better People — Director
6. Sweetieface (2013) — Director
7. Pretty Girls (2008) — Director
8. Nice People — Director