Complete filmography
Everything Mark O'Brien is credited on. Titles we have reviewed carry their Fi1m score; press Request a review on any other and it goes on our list.
2020s
The Outer Threat 2026as Daniel Ashford
The Voices of Our Mother 2026as William · Director, Writer
The Copenhagen Test 2025Seriesas Edmund Cobb · 8 eps
Nuremberg 2025as Colonel John AmenFi1m 64
The Memory Keeper 2025as Elizeus Carrier
Shadow of God 2025as Mason Harper
Seven Veils 2025as Paul
Topper 2025as Topper
The Sticky 2024Seriesas Charlie · 1 ep
61st Street 2022Seriesas Officer Logan · 8 eps
Blue Bayou 2021as Ace
The Righteous 2021as Aaron Smith · Executive Producer, Director, Writer
Your Honor 2020Seriesas Father Jay · 3 eps
Perry Mason 2020Seriesas Thomas Milligan · 7 epsFi1m 66
2010s
Hammer 2019as Chris Davis
Marriage Story 2019as Carter MitchumFi1m 84
Ready or Not 2019as Alex
City on a Hill 2019Seriesas Jimmy Ryan · 14 eps
Goalie 2019as Terry Sawchuk · Executive Producer
State Like Sleep 2019as Darren
The Front Runner 2018as Billy Shore
Bad Times at the El Royale 2018as Larsen Rogers
Kin 2018as Jake
The Darkest Minds 2018as Rob Meadows