Killjoys Wiki
Mark O’Brien
Mark O'Brien Promotional.jpg
Role Grayson Hicks
IMDb Mark O’Brien

Mark O’Brien is an actor and director, known for Republic of Doyle (2010), End of Days, Inc. (2015) and Grown Up Movie Star (2009).

Mark portrays Grayson Hicks in Season 1 of Killjoys.


Mark O'Brien was born on May 7, 1984 in St. John's, Newfoundland, Canada. He has been married to Georgina Reilly since January 6, 2013.


Year Title Role Notes
2005 Downward Calling John Doe Short
2008 Heartless Disappearance Into Labrador Seas Charlie Short
2008 Epilogue Henry Short
2008 Patiently Wasting Paul Short
2009 Cut from the Same Cloth Jack Cochrane Short
2009 Mum's the Word Curtis Short
2009 Grown Up Movie Star Will Short
2009 Quiet at Dawn Watts Short
2010 Snarbuckled Jacob O'Higgins Short
2010 Brad Brad Short
2012 Beat Down Michael
2012 Better People John Short
2013 Sweetieface Short
2015 Len and Company Zach
2015 End of Days, Inc. Jason
2015 Dennis Dennis Short
2015 The Dark Stranger Mark
2015 Whitehorse Evan Short
2015 Wanderer Eric Short
2015 How to Plan an Orgy in a Small Town Bruce Buck
2016 Story of Your Life Captain Marks
Year Title Role Notes
2005 Legends and Lore of the North Atlantic
2006 Above and Beyond Drake 2 episodes
2006 You're It! Mark / Various 10 episodes
2008 Gossip Tommy Palchek TV Movie
2011 Warehouse 13 Jerry Hoffler Episode: “Don't Hate the Player”
2012 Murdoch Mysteries Jerome Bradley Episode: “Murdoch Night in Canada”
2012 Diary of a Deadly P.I. Des Courtney 11 episodes
2013 This Hour Has 22 Minutes Des Courtney Episode: “The 22 Minutes Holiday Special”
2010-2014 Republic of Doyle Des Courtney 78 episodes
2014 Saving Hope Marshall Parker Episode: “Awakenings”
2014 Hannibal Randall Tier 2 episodes
2015 Halt and Catch Fire Tom Rendon 9 episodes
2015 Killjoys Grayson Hicks Episode: “Kiss Kiss Bye Bye
2016 The Last Tycoon Max Miner TV Movie


= Mark O’Brien at IMDB [1]