Mark O'Brien

Actor

Born: May 7, 1984 (41 years old)

Place of birth: St. Johns, Newfoundland, Canada

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).

Filmography (35)

• Nuremberg (2025, ★ 7.4)
• Arrival (2016, ★ 7.6)
• Marriage Story (2019, ★ 7.7)
• Hannibal (2013, ★ 8.2)
• Your Honor (2020, ★ 8.1)
• The Darkest Minds (2018, ★ 7)
• Bad Times at the El Royale (2018, ★ 6.8)
• Goalie (2019, ★ 7)
• Ready or Not (2019, ★ 7.1)
• Blue Bayou (2021, ★ 7.5)
• Perry Mason (2020, ★ 7.2)
• Republic of Doyle (2010, ★ 7)
• The Last Tycoon (2017, ★ 7)
• Halt and Catch Fire (2014, ★ 7.9)
• 61st Street (2022, ★ 6.9)
• Killjoys (2015, ★ 6.9)
• City on a Hill (2019, ★ 7.2)
• Warehouse 13 (2009, ★ 7.7)
• The Sticky (2024, ★ 7.2)
• Seven Veils (2025, ★ 5.6)
• Shadow of God (2025, ★ 5.7)
• End of Days, Inc. (2015, ★ 5.7)
• Anon (2018, ★ 6)
• Kin (2018, ★ 6.1)
• Grown Up Movie Star (2010, ★ 5.1)
• Parallel (2018, ★ 6)
• The Front Runner (2018, ★ 5.9)
• The Copenhagen Test (2025, ★ 6.4)
• The Dark Stranger (2016, ★ 4.9)
• Hammer (2019, ★ 5.4)