Acting

Mark O'Brien

1984-05-07 · 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).

Movies & TV shows

57 credits

The Kelly Clarkson Show

2019 · Self

Not in this catalog

Hannibal

2013 · Randall Tier

Not in this catalog

Warehouse 13

2009 · Jerry Hoffler

Not in this catalog

MOVIE

Arrival

2016 · Captain Marks

Not in this catalog

Perry Mason

2020 · Thomas Milligan

Not in this catalog

Republic of Doyle

2010 · Des Courtney

Not in this catalog

Halt and Catch Fire

2014 · Tom Rendon

Not in this catalog

Killjoys

2015 · Grayson Hicks

Not in this catalog

MOVIE

Ready or Not

2019 · Alex

MOVIE

Nuremberg

2025 · Colonel John Amen

Your Honor

2020 · Father Jay

Not in this catalog

The Copenhagen Test

2025 · Edmund Cobb

City on a Hill

2019 · Jimmy Ryan

Not in this catalog

MOVIE

The Outer Threat

2026 · Daniel Ashford

Not in this catalog

MOVIE

Bad Times at the El Royale

2018 · Larsen Rogers

MOVIE

Marriage Story

2019 · Carter Mitchum

61st Street

2022 · Officer Logan

Not in this catalog

The Sticky

2024 · Charlie

Not in this catalog

MOVIE

The Darkest Minds

2018 · Rob Meadows

The Last Tycoon

2017 · Max Miner

Not in this catalog

MOVIE

Anon

2018 · Cyrus Frear

MOVIE

How It Ends

2018 · Jeremiah

MOVIE

The Front Runner

2018 · Billy Shore

Not in this catalog

MOVIE

Kin

2018 · Jake

MOVIE

Parallel

2018 · Josh

MOVIE

Blue Bayou

2021 · Ace

MOVIE

Seven Veils

2025 · Paul

Not in this catalog

MOVIE

Shadow of God

2025 · Mason Harper

Not in this catalog

MOVIE

The Memory Keeper

2025 · Elizeus Carrier

Not in this catalog

MOVIE

The Dark Stranger

2016 · Mark

Not in this catalog

MOVIE

How to Plan an Orgy in a Small Town

2015 · Bruce Buck

MOVIE

Beat Down

2012 · Michael

Not in this catalog

MOVIE

Goalie

2019 · Terry Sawchuk

Not in this catalog

MOVIE

Little One

—

Not in this catalog

MOVIE

The Righteous

2021 · Aaron Smith

Not in this catalog

MOVIE

State Like Sleep

2019 · Darren

Not in this catalog

No poster

MOVIE

Epilogue

2008 · Henry

Not in this catalog

MOVIE

The Four Horsemen

2008 · Eric Rollins

Not in this catalog

MOVIE

The Voices of Our Mother

2026 · William

Not in this catalog

MOVIE

Dennis

2015 · Dennis

Not in this catalog

No poster

MOVIE

Better People

— · John

Not in this catalog

MOVIE

Hammer

2019 · Chris Davis

Not in this catalog

MOVIE

Brad

2010 · Brad

Not in this catalog

MOVIE

The One That Got Away

2008 · Tommy Palchek

Not in this catalog

MOVIE

Heartless Disappearance Into Labrador Seas

2008 · Charlie

Not in this catalog

No poster

MOVIE

Good in the Room

— · Charlie

Not in this catalog

MOVIE

Topper

2025 · Topper

Not in this catalog

MOVIE

End of Days, Inc.

2015 · Jason

Not in this catalog

MOVIE

Grown Up Movie Star

2010 · Will

Not in this catalog

No poster

MOVIE

Quiet at Dawn

2009 · Watts

Not in this catalog

MOVIE

Wanderer

2016 · Eric

Not in this catalog

No poster

MOVIE

Nice People

—

Not in this catalog

No poster

MOVIE

Cut from the Same Cloth

2009 · Jack Cochrane

Not in this catalog

No poster

MOVIE

Sweetieface

2013 · Sam

Not in this catalog

No poster

MOVIE

Soma

— · Paul

Not in this catalog

No poster

MOVIE

Mum's the Word

2009 · Curtis

Not in this catalog

MOVIE

Snarbuckled

2010 · Jacob O'Higgins

Not in this catalog