Pehrsson began his professional career as a runner and lighting assistant, progressing to work as a gaffer on feature films, television productions and commercials. Alongside this work, he shot approximately 30 short films, several supported by the Danish Film Workshop. He subsequently attended the National Film and Television School in the United Kingdom, where he studied cinematography and completed a master’s degree in 2003. His training included working with cinematographers Alec Mills, Billy Williams, Ernie Vincze and Brian Tufano.
After graduating, Pehrsson entered the British television industry, initially working as a camera operator before becoming a director of photography. His early television credits include The Bill, Dream Team, Holby City and Bad Girls. He went on to photograph episodes of Doctor Who, Luther, The Musketeers, Jonathan Strange & Mr Norrell, Inside No. 9 and Humans, working across crime drama, science fiction, fantasy and comedy.
Pehrsson’s later work includes the American adaptation of Utopia (2020), Les Misérables (2018–2019), The City and the City (2018), The Winter King (2023), Wednesday (2022) and SAS: Rogue Heroes (2022). He photographed the Black Mirror episode “U.S.S. Callister”, which earned him a Primetime Emmy nomination for cinematography, and the episode “Demon 79”, for which he received a BAFTA Television Craft Award for Photography and Lighting: Fiction. His more recent credits include The Gentlemen (2024) and MobLand (2025–2026).