Sam Swainsbury was born in Colchester and grew up in Halstead, Essex. He attended Holy Trinity School. He participated in workshops at the Quay Theatre in Sudbury.[1]
In 2013, Swainsbury featured on the film Thor: The Dark World, he played a Stonehenge TV News Reporter.[2] From 2016 to 2019, he starred in the BBC sitcom Mum, as Jason.[3] In 2017, Swainsbury appeared on Fearless, a six-part British crime thriller drama series, he played Kevin Russell, a 37-year-old man who insists he was wrongly imprisoned for 14 years for the murder of Linda Simms.[4][5] In 2019, he appeared in an episode of the ITV drama Victoria as Dr John Snow.[6][7]
