Portrait of Mark O'Brien

Mark O'Brien

Bio: 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)
Born: Mon, May 07 1984
Birthplace: St. Johns, Newfoundland, Canada
Mark O'Brien is 40 years old
External Links
IMDb logo
Sort by Popularity
Scroll to TV Credits
Acting Roles
Crew Roles

Movies (Acting Roles)

Sorted by Release Date
Poster of Seven Veils
Seven Veils
Mark O'Brien will be
40 in Seven Veils
as 'Paul'.
Thu, Feb 27 2025
Poster of Blue Bayou
Blue Bayou
Mark O'Brien was
37 in Blue Bayou
as 'Ace'.
Fri, Sep 10 2021
Poster of The Righteous
The Righteous
Mark O'Brien was
37 in The Righteous
as 'Aaron Smith'.
Sun, Aug 15 2021
Poster of Hammer
Hammer
Mark O'Brien was
35 in Hammer
as 'Chris Davis'.
Thu, Dec 05 2019
Poster of Marriage Story
Marriage Story
Mark O'Brien was
35 in Marriage Story
as 'Carter Mitchum'.
Sat, Sep 28 2019
Poster of Ready or Not
Ready or Not
Mark O'Brien was
35 in Ready or Not
as 'Alex Le Domas'.
Wed, Aug 21 2019
Poster of Goalie
Goalie
Mark O'Brien was
34 in Goalie
as 'Terry Sawchuk'.
Fri, Mar 01 2019
Poster of State Like Sleep
State Like Sleep
Mark O'Brien was
34 in State Like Sleep
as 'Darren'.
Fri, Jan 04 2019
Poster of The Front Runner
The Front Runner
Mark O'Brien was
34 in The Front Runner
as 'Billy Shore'.
Tue, Nov 06 2018
Poster of Bad Times at the El Royale
Bad Times at the El Royale
Mark O'Brien was
34 in Bad Times at the El Royale
as 'Larsen Rogers'.
Thu, Oct 04 2018
Poster of Kin
Kin
Mark O'Brien was
34 in Kin
as 'Jake'.
Wed, Aug 29 2018
Poster of The Darkest Minds
The Darkest Minds
Mark O'Brien was
34 in The Darkest Minds
as 'Rob Meadows'.
Wed, Jul 25 2018
Poster of How It Ends
How It Ends
Mark O'Brien was
34 in How It Ends
as 'Jeremiah'.
Fri, Jul 13 2018
Poster of Anon
Anon
Mark O'Brien was
33 in Anon
as 'Cyrus Frear'.
Thu, May 03 2018
Poster of Parallel
Parallel
Mark O'Brien was
33 in Parallel
as 'Josh'.
Tue, Apr 10 2018
Poster of Arrival
Arrival
Mark O'Brien was
32 in Arrival
as 'Captain Marks'.
Thu, Nov 10 2016
Poster of The Dark Stranger
The Dark Stranger
Mark O'Brien was
32 in The Dark Stranger
as 'Mark'.
Fri, Jul 15 2016
Poster of How to Plan an Orgy in a Small Town
How to Plan an Orgy in a Small Town
Mark O'Brien was
31 in How to Plan an Orgy in a Small Town
as 'Bruce Buck'.
Sat, Sep 19 2015
Poster of End of Days, Inc.
End of Days, Inc.
Mark O'Brien was
30 in End of Days, Inc.
as 'Jason'.
Fri, Apr 24 2015
Poster of Dennis
Dennis
Mark O'Brien was
30 in Dennis
as 'Dennis'.
Sat, Apr 18 2015
Poster of Beat Down
Beat Down
Mark O'Brien was
28 in Beat Down
as 'Michael'.
Fri, Aug 03 2012
Poster of Snarbuckled
Snarbuckled
Mark O'Brien was
26 in Snarbuckled
as 'Jacob O'Higgins'.
Sat, Sep 18 2010
Poster of Brad
Brad
Mark O'Brien was
26 in Brad
as 'Brad'.
Sat, Jul 24 2010
Poster of Grown Up Movie Star
Grown Up Movie Star
Mark O'Brien was
25 in Grown Up Movie Star
as 'Will'.
Tue, Oct 20 2009
Poster of Cut from the Same Cloth
Cut from the Same Cloth
Mark O'Brien was
24 in Cut from the Same Cloth
as 'Jack Cochrane'.
Thu, Jan 01 2009
Poster of Heartless Disappearance Into Labrador Seas
Heartless Disappearance Into Labrador Seas
Mark O'Brien was
24 in Heartless Disappearance Into Labrador Seas
as 'Charlie'.
Tue, Sep 09 2008
Poster of Epilogue
Epilogue
Mark O'Brien was
24 in Epilogue
as 'Henry'.
Fri, Jun 27 2008
Poster of The Four Horsemen
The Four Horsemen
Mark O'Brien was
23 in The Four Horsemen
as 'Eric Rollins'.
Tue, Mar 18 2008
Poster of Shadow of God
Shadow of God
Mark O'Brien will be
40+ in Shadow of God
as 'Mason Harper'.
Unreleased
Poster of The Voices of Our Mother
The Voices of Our Mother
Mark O'Brien will be
40+ in The Voices of Our Mother
as 'William'.
Unreleased
Poster of Mum's the Word
Mum's the Word
Mark O'Brien will be
40+ in Mum's the Word
as 'Curtis'.
Unreleased
Poster of The Embers and the Stars
The Embers and the Stars
Mark O'Brien will be
40+ in The Embers and the Stars
Unreleased
Poster of Falsehood
Falsehood
Mark O'Brien will be
40+ in Falsehood
as 'Elizeus Carrier'.
Unreleased
Poster of Nuremberg
Nuremberg
Mark O'Brien will be
40+ in Nuremberg
as 'Col. John Amen'.
Unreleased

TV Shows (Acting Roles)

Sorted by Release Date
Ages in TV shows are based off the first air date and may not be accurate. View individual episode details for accurate ages
Poster of The Sticky
The Sticky
Mark O'Brien was
40+ in The Sticky
as 'Charlie'.
First Air Date
Fri, Dec 06 2024
Poster of 61st Street
61st Street
Mark O'Brien was
37+ in 61st Street
as 'Officer Logan'.
First Air Date
Sun, Apr 10 2022
Poster of Your Honor
Your Honor
Mark O'Brien was
36+ in Your Honor
as 'Father Jay'.
First Air Date
Sun, Dec 06 2020
Poster of Perry Mason
Perry Mason
Mark O'Brien was
36+ in Perry Mason
as 'Thomas Milligan'.
First Air Date
Sun, Jun 21 2020
Poster of The Kelly Clarkson Show
The Kelly Clarkson Show
Mark O'Brien was
35+ in The Kelly Clarkson Show
First Air Date
Mon, Sep 09 2019
Poster of City on a Hill
City on a Hill
Mark O'Brien was
35+ in City on a Hill
as 'Jimmy Ryan'.
First Air Date
Sun, Jun 16 2019
Poster of The Last Tycoon
The Last Tycoon
Mark O'Brien was
33+ in The Last Tycoon
as 'Max Miner'.
First Air Date
Fri, Jul 28 2017
Poster of Killjoys
Killjoys
Mark O'Brien was
31+ in Killjoys
as 'Grayson Hicks'.
First Air Date
Fri, Jun 19 2015
Poster of Halt and Catch Fire
Halt and Catch Fire
Mark O'Brien was
30+ in Halt and Catch Fire
as 'Tom Rendon'.
First Air Date
Sun, Jun 01 2014
Poster of Hannibal
Hannibal
Mark O'Brien was
28+ in Hannibal
as 'Randall Tier'.
First Air Date
Thu, Apr 04 2013
Poster of Republic of Doyle
Republic of Doyle
Mark O'Brien was
25+ in Republic of Doyle
as 'Des Courtney'.
First Air Date
Wed, Jan 06 2010
Poster of Warehouse 13
Warehouse 13
Mark O'Brien was
25+ in Warehouse 13
as 'Jerry Hoffler'.
First Air Date
Tue, Jul 07 2009
Poster of Copenhagen
Copenhagen
Mark O'Brien will be
40+ in Copenhagen
as 'Cobb'.
First Air Date
Unreleased