Mark O'Brien

ActingMay 7, 1984(age 41) St. Johns, Newfoundland, Canada

Explore the best Mark O'Brien movies ranked by Movie Rankings users. Browse biography, ranked filmography, and movie detail links for Mark O'Brien.

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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).

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Last refreshed from site data on May 5, 2026.

TMDB biography data

Biography, portrait, department, and filmography metadata sourced from TMDB.

Movie Rankings comparisons

Community comparison results and ranked credits sourced from Movie Rankings users.

Filmography (50)

2025·Colonel John Amen

The Memory Keeper

2025·Elizeus Carrier

Other Credits (8)

The Righteous

2021·Director

Goalie

2019·Executive Producer