Actor

Mark O'Brien

May 7, 1984 · St. Johns, Newfoundland, Canada

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).

Notable work

7.6
Arrival (2016)
as Captain Marks
7.7
Marriage Story (2019)
as Carter Mitchum
7.1
Ready or Not (2019)
as Alex
6.8
Bad Times at the El Royale (2018)
as Larsen Rogers
8.3
Hannibal (2013)
as Randall Tier
7
The Darkest Minds (2018)
as Rob Meadows
5.3
How It Ends (2018)
as Jeremiah
6
Anon (2018)
as Cyrus Frear
8.1
Your Honor (2020)
as Father Jay
7.6
Nuremberg (2025)
as Colonel John Amen
6.1
Kin (2018)
as Jake
7.7
Warehouse 13 (2009)
as Jerry Hoffler

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