Biography
O'Brien grew up in nearby Royton and was educated at the Bishop Henshaw Roman Catholic Memorial High School in Rochdale. He began acting at an early age and was the star of a BBC TV series Gruey by the time he was 15. He also featured in several other series at the time in one-off or recurring roles. In 1993, he played the role of Craig Lee in Coronation Street and then the role of Lee Jones in Children's Ward. In 1993 he also became a regular in the detective series, Cracker, playing Mark, the son of central character Robbie Coltrane. In 1999 he made his cinema debut with the film Virtual Sexuality and began a reunited with Cracker director Michael Winterbottom for 24 Hour Party People in 2002 and, in '04, for the controversial 9 Songs, which included scenes of genuine sexual intercourse between O'Brien and his leading lady Margo Stilley. His role had earned him the credit of being the only mainstream British actor who has been shown ejaculating in a mainstream UK-produced feature. Since 9 Songs, O'Brien has made two further films with Winterbottom; A Cock and Bull Story and The Look of Love. Recent regular TV roles include Holby Blue and The Syndicate.
Filmography
Cast Credits

Trucking Heavy: Massive Moves
Character: Narrator
TV • 2025

A Thousand Blows
Character: Mr Harkness
TV • 2025

The Family Pile
Character: Stuart
TV • 2023

Andor
Character: Pegla
TV • 2022

The Following Year
Character: Ben
MOVIE • 2021

The Cars That Made the World
Character: Self - Narrator
TV • 2020

Ted Lasso
Character: James Tartt
TV • 2020

Years and Years
Character: Woody
TV • 2019

Chernobyl
Character: Khodemchuck
TV • 2019

Holmes & Watson
Character: PC Smalls
MOVIE • 2018

Peterloo
Character: Peter Wilkes, a Farrier
MOVIE • 2018

Trucking Hell
Character:
TV • 2018

In the Dark
Character: DS Gary Kenny
TV • 2017

The Watchman
Character: Lee Simpson
MOVIE • 2016

Grantchester
Character: Arthur Evans
TV • 2014

Glue
Character: Thomas Bray
TV • 2014

Prey
Character: Phil Prentice
TV • 2014

The Look of Love
Character: Jimmy Humphries
MOVIE • 2013

Bluestone 42
Character: Nutsack
TV • 2013

Spike Island
Character: Poster Vendor
MOVIE • 2012
Crew