Mark O'Brien
Actor · Director · Writer · Executive Producer
Born May 7, 1984 · St. Johns, Newfoundland, Canada
Active 2008–present
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).
Filmography
Nuremberg (2025) — Colonel John AmenThe Copenhagen Test (2025) — Edmund CobbThe Outer Threat (2026) — Daniel AshfordSeven Veils (2025) — PaulThe Memory Keeper (2025) — Elizeus CarrierArrival (2016) — Captain MarksMarriage Story (2019) — Carter MitchumHannibal (2013) — Randall TierReady or Not (2019) — AlexYour Honor (2020) — Father JayBad Times at the El Royale (2018) — Larsen RogersThe Darkest Minds (2018) — Rob MeadowsWarehouse 13 (2009) — Jerry HofflerHalt and Catch Fire (2014) — Tom RendonAnon (2018) — Cyrus FrearKilljoys (2015) — Grayson HicksPerry Mason (2020) — Thomas MilliganBlue Bayou (2021) — AceKin (2018) — JakeHow It Ends (2018) — JeremiahCity on a Hill (2019) — Jimmy RyanThe Front Runner (2018) — Billy ShoreThe Sticky (2024) — CharlieParallel (2018) — Josh