
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.

Trucking Heavy: Massive Moves

チェルノブイリ

バンド・オブ・ブラザース

テッド・ラッソ:破天荒コーチがゆく

スター・ウォーズ:キャシアン・アンドー

The Cars That Made the World

Life on Mars

Years and Years

Death in Paradise

Silk

No Offence

Vera

Bluestone 42

New Tricks

Trucking Hell

Grantchester

Messiah

The Shock Doctrine

Heartbeat

Holby Blue

Moving On

24アワー・パーティー・ピープル

Cracker: Nine Eleven

Bloodlines

Secret Diary of a Call Girl

ピータールー マンチェスターの悲劇

GOAL! STEP1 イングランドプレミアリーグの誓い

クックー

Blue Murder

Dramarama

The Last Enemy

Prey

Cracker

A Thousand Blows

Monster Maker

Bellman and True

Spike Island

Dalziel & Pascoe

Jason and the Argonauts

Casualty

A Cock and Bull Story

Glue

The Watchman

Love Life

GOAL!2 STEP:2 ヨーロッパ・チャンピオンへの挑戦

The Banker

The Look of Love

ナイン・ソングス

The Following Year

Virtual Sexuality

Burn It

Indie Sex

Children's Ward

俺たちホームズ&ワトソン

Elizabeth David: A Life in Recipes

The Family Pile

The Afternoon Play

Born to Run