Mark O'Brien

Mark O'Brien

41 · Born: May 7, 1984

Personal Details

Official Socials
BornMay 7, 1984 St. Johns, Newfoundland, Canada
Relatives
  • Sibling (Sibling)

Biography

Mark O'Brien, a remarkably gifted and accomplished individual, emerged into the world on May 7th, 1984, within the borders of Canada, a country that would subsequently serve as the backdrop for his remarkable ascent as a versatile and multifaceted actor and director.

Throughout the trajectory of his professional journey, Slattery's reputation would increasingly be solidified through his exceptional acting abilities, particularly in his iconic depiction of the enigmatic and captivating character of Des Courtney in the phenomenally popular television series Republic of Doyle, which made its inaugural appearance on the small screen in 2010, garnering widespread acclaim and recognition from audiences and critics alike.

Notably, O'Brien's professional endeavors would extend beyond his prominent role in Republic of Doyle, as he would subsequently leave an indelible mark on the television landscape through his masterful portrayal of Tom Rendon in the highly acclaimed series Halt and Catch Fire, which premiered in 2014 to widespread critical acclaim.

Mark O'Brien has demonstrated an extraordinary capacity for adapting to diverse roles and genres, thereby firmly establishing himself as a renowned and accomplished figure within the realm of entertainment, boasting a remarkable range that has garnered widespread recognition and admiration from audiences and industry professionals alike.

Career

{"id":234307,"title":"Seven Veils","year":"2025","character":"Paul","permalink":"https:\/\/streambutter.com\/us\/movie\/seven-veils","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_234307.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_234307.jpg"},"released":1}
2025
{"id":279380,"title":"Topper","year":"2025","character":"Topper","permalink":"https:\/\/streambutter.com\/us\/movie\/topper-2025","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_279380.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_279380.jpg"},"released":1}
Topper
Topper as Topper
{"id":280564,"title":"Shadow of God","year":"2025","character":"Mason Harper","permalink":"https:\/\/streambutter.com\/us\/movie\/shadow-of-god","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_280564.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_280564.jpg"},"released":1}
Shadow of God
Shadow of God as Mason Harper
{"id":103835055,"title":"Perry Mason","year":2023,"character":"Thomas Milligan","permalink":"https:\/\/streambutter.com\/us\/show\/perry-mason","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/shows\/poster\/7qhge26fqkh0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/shows\/poster\/7qhge26fqkh0.jpg"},"released":1}
2023
Perry Mason
Perry Mason as Thomas Milligan
{"id":103838612,"title":"61st Street","year":2022,"character":"Officer Logan","permalink":"https:\/\/streambutter.com\/us\/show\/61st-street","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/shows\/poster\/5ftqjuguk900.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/shows\/poster\/5ftqjuguk900.jpg"},"released":1}
2022
61st Street
61st Street as Officer Logan
{"id":195947,"title":"The Righteous","year":"2021","character":"Aaron Smith","permalink":"https:\/\/streambutter.com\/us\/movie\/the-righteous","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/6t23gt6b0up0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/6t23gt6b0up0.jpg"},"released":1}
2021
The Righteous
The Righteous as Aaron Smith
{"id":193868,"title":"Blue Bayou","year":"2021","character":"Ace","permalink":"https:\/\/streambutter.com\/us\/movie\/blue-bayou-2021","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/5usl5cosopm0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/5usl5cosopm0.jpg"},"released":1}
{"id":138316,"title":"Goalie","year":"2019","character":"Terry Sawchuk","permalink":"https:\/\/streambutter.com\/us\/movie\/goalie-2019","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_138316.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_138316.jpg"},"released":1}
2019
Goalie
Goalie as Terry Sawchuk
{"id":130752,"title":"State Like Sleep","year":"2019","character":"Darren","permalink":"https:\/\/streambutter.com\/us\/movie\/state-like-sleep","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/qaol2ascc040.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/qaol2ascc040.jpg"},"released":1}
{"id":138911,"title":"Ready or Not","year":"2019","character":"Alex Le Domas","permalink":"https:\/\/streambutter.com\/us\/movie\/ready-or-not-2019","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/562f4ugvu0d0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/562f4ugvu0d0.jpg"},"released":1}
Ready or Not
Ready or Not as Alex Le Domas
{"id":170606,"title":"Hammer","year":"2019","character":"Chris Davis","permalink":"https:\/\/streambutter.com\/us\/movie\/hammer-2019","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/1rg6lmoegoeo.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/1rg6lmoegoeo.jpg"},"released":1}
Hammer
Hammer as Chris Davis
{"id":140151,"title":"Marriage Story","year":"2019","character":"Carter Mitchum","permalink":"https:\/\/streambutter.com\/us\/movie\/marriage-story","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/c0u37sqt0p00.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/c0u37sqt0p00.jpg"},"released":1}
Marriage Story
Marriage Story as Carter Mitchum
{"id":103832510,"title":"City on a Hill","year":2019,"character":"Jimmy Ryan","permalink":"https:\/\/streambutter.com\/us\/show\/city-on-a-hill","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/shows\/poster\/60u2movfr7n0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/shows\/poster\/60u2movfr7n0.jpg"},"released":1}
City on a Hill
City on a Hill as Jimmy Ryan
{"id":131976,"title":"The Front Runner","year":"2018","character":"Billy Shore","permalink":"https:\/\/streambutter.com\/us\/movie\/the-front-runner","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/5rgpmhgagtt0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/5rgpmhgagtt0.jpg"},"released":1}
2018
The Front Runner
The Front Runner as Billy Shore
{"id":132704,"title":"How It Ends","year":"2018","character":"Jeremiah","permalink":"https:\/\/streambutter.com\/us\/movie\/how-it-ends","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/1jhupm2s7rh8.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/1jhupm2s7rh8.jpg"},"released":1}
How It Ends
How It Ends as Jeremiah
{"id":121922,"title":"Anon","year":"2018","character":"Cyrus Frear","permalink":"https:\/\/streambutter.com\/us\/movie\/anon","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/655dq40vu7j0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/655dq40vu7j0.jpg"},"released":1}
Anon
Anon as Cyrus Frear
{"id":125076,"title":"Parallel","year":"2018","character":"Josh","permalink":"https:\/\/streambutter.com\/us\/movie\/parallel-2018","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/580tips7tdu0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/580tips7tdu0.jpg"},"released":1}
Parallel
Parallel as Josh
{"id":128346,"title":"The Darkest Minds","year":"2018","character":"Rob Meadows","permalink":"https:\/\/streambutter.com\/us\/movie\/the-darkest-minds","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/7fhpfa2q7j70.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/7fhpfa2q7j70.jpg"},"released":1}
The Darkest Minds
The Darkest Minds as Rob Meadows
{"id":132315,"title":"Bad Times at the El Royale","year":"2018","character":"Larsen Rogers","permalink":"https:\/\/streambutter.com\/us\/movie\/bad-times-at-the-el-royale","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/1hgjbdgf0omg.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/1hgjbdgf0omg.jpg"},"released":1}
{"id":131542,"title":"Kin","year":"2018","character":"Jake","permalink":"https:\/\/streambutter.com\/us\/movie\/kin-2018","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/73rquvk1d0p0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/73rquvk1d0p0.jpg"},"released":1}
Kin
Kin as Jake
{"id":12424,"title":"The Last Tycoon","year":2017,"character":"Max Miner","permalink":"https:\/\/streambutter.com\/us\/show\/the-last-tycoon","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/shows\/poster\/ev4q3vrhguo0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/shows\/poster\/ev4q3vrhguo0.jpg"},"released":1}
2017
The Last Tycoon
The Last Tycoon as Max Miner
{"id":99377,"title":"Arrival","year":"2016","character":"Captain Marks","permalink":"https:\/\/streambutter.com\/us\/movie\/arrival","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/618elb986tj0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/618elb986tj0.jpg"},"released":1}
2016
Arrival
Arrival as Captain Marks
{"id":104571,"title":"The Dark Stranger","year":"2016","character":"Mark","permalink":"https:\/\/streambutter.com\/us\/movie\/the-dark-stranger","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/6pp90oh6eio0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/6pp90oh6eio0.jpg"},"released":1}
{"id":36590,"title":"End of Days, Inc.","year":"2015","character":"Jason","permalink":"https:\/\/streambutter.com\/us\/movie\/end-of-days-inc","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_36590.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_36590.jpg"},"released":1}
2015
{"id":101388,"title":"How to Plan an Orgy in a Small Town","year":"2015","character":"Bruce Buck","permalink":"https:\/\/streambutter.com\/us\/movie\/how-to-plan-an-orgy-in-a-small-town","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/1o9e8riot2s0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/1o9e8riot2s0.jpg"},"released":1}
{"id":104421,"title":"Len and Company","year":"2015","character":"Zach","permalink":"https:\/\/streambutter.com\/us\/movie\/len-and-company","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_104421.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_104421.jpg"},"released":1}
{"id":2900,"title":"Killjoys","year":2015,"character":"Grayson Hicks","permalink":"https:\/\/streambutter.com\/us\/show\/killjoys","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/shows\/poster\/3l3v2hidt2s0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/shows\/poster\/3l3v2hidt2s0.jpg"},"released":1}
Killjoys
Killjoys as Grayson Hicks
{"id":922,"title":"Halt and Catch Fire","year":2015,"character":"Tom Rendon","permalink":"https:\/\/streambutter.com\/us\/show\/halt-and-catch-fire","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/shows\/poster\/46kq131hoa70.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/shows\/poster\/46kq131hoa70.jpg"},"released":1}
{"id":171624,"title":"Beat Down","year":"2012","character":"Michael","permalink":"https:\/\/streambutter.com\/us\/movie\/beat-down","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_171624.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_171624.jpg"},"released":1}
2012
Beat Down
Beat Down as Michael
{"id":265344,"title":"Snarbuckled","year":"2010","character":"Jacob O'Higgins","permalink":"https:\/\/streambutter.com\/us\/movie\/snarbuckled","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_265344.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_265344.jpg"},"released":1}
2010
Snarbuckled
Snarbuckled as Jacob O'Higgins
{"id":1909,"title":"Republic of Doyle","year":2010,"character":"Des Courtney","permalink":"https:\/\/streambutter.com\/us\/show\/republic-of-doyle","type":"show","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/show_1909.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/show_1909.jpg"},"released":1}
Republic of Doyle
Republic of Doyle as Des Courtney
{"id":45092,"title":"Grown Up Movie Star","year":"2009","character":"Will","permalink":"https:\/\/streambutter.com\/us\/movie\/grown-up-movie-star","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_45092.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_45092.jpg"},"released":1}
2009
{"id":46537,"title":"The Four Horsemen","year":"2008","character":"Eric Rollins","permalink":"https:\/\/streambutter.com\/us\/movie\/the-four-horsemen","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_46537.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_46537.jpg"},"released":1}
2008
The Four Horsemen
The Four Horsemen as Eric Rollins
{"id":255473,"title":"Heartless Disappearance Into Labrador Seas","year":"2008","character":"Charlie","permalink":"https:\/\/streambutter.com\/us\/movie\/heartless-disappearance-into-labrador-seas","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_255473.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_255473.jpg"},"released":1}
{"id":183853,"title":"The One That Got Away","year":"2008","character":"Tommy Palchek","permalink":"https:\/\/streambutter.com\/us\/movie\/the-one-that-got-away-2008","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/thumbs\/movie_183853.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/thumbs\/movie_183853.jpg"},"released":1}
The One That Got Away
The One That Got Away as Tommy Palchek
{"id":195947,"title":"The Righteous","year":"2021","job":"Director, Writer","permalink":"https:\/\/streambutter.com\/us\/movie\/the-righteous","type":"movie","srcset":{"1x":"https:\/\/img.streambutter.com\/img\/90x135\/images\/fanart\/movies\/poster\/6t23gt6b0up0.jpg","2x":"https:\/\/img.streambutter.com\/img\/180x270\/images\/fanart\/movies\/poster\/6t23gt6b0up0.jpg"},"released":1}
2021
The Righteous
The Righteous as Director, Writer