Mark O'Brien

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 (7)

Nuremberg

2025 ★ 7.4

as Colonel John Amen

Ready or Not

2019 ★ 7.0

as Alex Le Domas

Kin

2018 ★ 6.1

as Jake

The Darkest Minds

2018 ★ 7.0

as Rob Meadows

How It Ends

2018 ★ 5.3

as Jeremiah

Anon

2018 ★ 6.0

as Cyrus Frear

Arrival

2016 ★ 7.6

as Captain Marks