Mark O'Brien (actor)

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Mark O'Brien
Mark O'Brien.jpg
O'Brien in 2013
Born (1984-05-07) May 7, 1984 (age 35)
OccupationActor, director
Years active2005–present
Georgina Reilly (m. 2013)

Mark O'Brien (born May 7, 1984) is a Canadian actor and director. He is best known for playing the roles of Des Courtney in Republic of Doyle and Tom Rendon in Halt and Catch Fire.[1][2][3]

Personal life[edit]

O'Brien married fellow CBC network star Georgina Reilly on January 6, 2013, after having met on the set of Republic of Doyle in 2011.[4]



Year Title Role Notes
2005 Downward Calling John Doe Short
2008 Patiently Wasting Paul
Epilogue Henry
Heartless Disappearance Into Labrador Seas Charlie
2009 Quiet at Dawn Watts
Grown Up Movie Star Will
Mum's the Word Curtis Short
Cut from the Same Cloth Jack Cochrane
2010 Brad Brad
Snarbuckled Jacob O'Higgins
2012 Beat Down Michael
Better People John Short
2013 Sweetieface
2015 Dennis Dennis
End of Days, Inc. Jason
Len and Company Zach
2016 Arrival Captain Marks
2018 Parallel Josh
State Like Sleep Darren
Anon Cyrus Frear
How It Ends Jeremiah
The Darkest Minds Rob Meadows
Kin Jake Stanton
The Front Runner Billy Shore
Bad Times at the El Royale Larsen Rogers
2019 Goalie Terry Sawchuk
Ready or Not Alex Le Domas
Marriage Story Carter
2020 Hammer Chris Davis Post-production
Blue Bayou Ace Filming


Year Title Role Notes
2005 Legends and Lore of the North Atlantic
2005–2007 Kids' CBC Himself
2006 Above and Beyond Drake 2 episodes
2008 The One That Got Away Tommy Palchek TV movie
2010–2014 Republic of Doyle Des Courtney 78 episodes
2011 Warehouse 13 Jerry Hoffler
2012 Diary of a Deadly P.I. Des Courtney 12 episodes
Murdoch Mysteries Jerome Bradley
2013 This Hour Has 22 Minutes Des Courtney
2014 Hannibal Randall Tier 2 episodes
Saving Hope Marshall Parker
2015–2016 Halt and Catch Fire Tom Rendon 14 episodes
2017 The Last Tycoon Max Miner 9 episodes
2019 City on a Hill Jimmy Ryan

Director, producer and writer[edit]

Title Year Credited as Notes Ref(s)
Director Writer Producer Actor Other
Downward Calling 2005 Yes Yes Yes Yes Yes Short film
Lying Awake 2006 Yes Yes Yes Yes Yes Short film
Cinematographer, composer and editor
Pretty Girls 2008 Yes No No No Yes Short film
Editor and cinematographer
Brad 2010 No No Yes Yes Yes Short film
Kathy 2011 Yes No No No No
Better People 2012 Yes Yes No Yes Yes
Sweetieface 2013 Yes No No Yes Yes
Dennis 2015 No No Yes Yes No


  1. ^ Wagmeister, Elizabeth (February 19, 2015). "AMC's 'Halt and Catch Fire' Adds Two Cast Members for Season 2". Variety. Retrieved July 27, 2015.
  2. ^ Barsanti, Sam (February 19, 2015). "Aleksa Palladino and Mark O'Brien join AMC's Halt And Catch Fire". The A.V. Club. Retrieved July 27, 2015.
  3. ^ "Mark O'Brien cast in AMC's Halt and Catch Fire". March 1, 2015. Retrieved July 27, 2015.
  4. ^ Emily Pratt (February 1, 2013). "CBC wedding edition: Mark O'Brien and Georgina Reilly". CBC Live. Retrieved February 15, 2013.

External links[edit]