[11] Harris played the iconic role of Magwitch in the BBC/FX Network/Disney adaptation of Great Expectations, alongside Academy Award winner Olivia Colman.

[13] In 2024, Harris played Osip Glebnikov in the new Showtime / Paramount production of A Gentleman in Moscow, starring Ewan McGregor.

In his late teens, he lived and worked as a dishwasher in Paris, France before returning to London to train as an actor.

[21] In 2012, he was cast in the Universal Pictures movie Snow White and the Huntsman starring Kristen Stewart, Charlize Theron and Chris Hemsworth.

[15] In 2015, Harris played Ronnie Morgan in the Sky Atlantic/Pivot 12-part drama Fortitude alongside Sir Michael Gambon and Stanley Tucci.

[7] He co-produced the film and also starred in the lead role, alongside Ray Winstone, Ian McShane and Michael Smiley.

[29] Harris also received a Writers Guild of Great Britain 'Best Debut Screenplay' Award nomination.

In the same year, he also made his debut behind the camera, directing the music video for the Paul Weller single, "Gravity".

That same year, he played Charlie Rowley in the BBC drama series The Salisbury Poisonings, a mini-series based on the tragic real life events of 2018.

[35] Harris played the iconic role of Magwitch, alongside Academy Award winner Olivia Colman (as Miss Havisham) in the new Disney/BBC/FX Networks co-production of Great Expectations.

The show is exec-produced by Sir Ridley Scott and Tom Hardy and adapted for the screen by Steven Knight, the creator of Peaky Blinders.

In 2024, Harris played Osip Glebnikov in the Showtime / Paramount production of A Gentleman in Moscow, starring Ewan McGregor.