Pedersen started writing in Scots for his
Portobello, Edinburgh high school magazine. He studied law at
Durham University (2002–2005) and lived in
London for several years before returning to Scotland and turning to writing and publishing full-time. Pedersen published two
chapbooks before compiling his first full poetry collection,
Play with Me, in 2013. In 2010, Pedersen co-founded with poet
Kevin Williamson the Edinburgh collective
Neu! Reekie!. Through it they produced some 200 showcases for poetry, music and arts, and published writings and poetry compilations. Pedersen continued to be heavily involved with Neu! Reekie! until its winding down in 2022. Pedersen had developed a close friendship with musician and illustrator
Scott Hutchison. In 2017 he released his second poetry collection,
Oyster, accompanied by illustrations from Hutchison. The publication led to joint performances of poetry and music across the UK and in South Africa. 2017 also saw the establishment of the Cold Turkey evenings around the festive season in December, which include performances from Pedersen,
Hollie McNish,
Withered Hand and special guests. That year's show featured Hutchison. The pair's performances continued into 2018, but the tour was cut short by Hutchison's death by suicide in May 2018, shortly before the two were due to make an appearance at the
Ullapool Book Festival. Pedersen, McNish and Withered Hand performed at the 2019 festival as a memorial to Hutchison. Pedersen also performed at the
Edinburgh International Book Festival leading a night titled "Good Grief!", where he and other performers discussed grief and healing. In mid-2018, Pedersen took up a writing residency at the
Bill Drummond-owned Curfew Tower in
Cushendall, Northern Ireland, where he began working on new material. It ended up the base for his next work, the prose book
Boy Friends. 2022 saw the release of
Boy Friends, an autobiographical work of prose dealing with male friendships, much of it regarding the kinship with Hutchison and dealing with his loss. The book received wide publicity and acclaim. In 2023, Pedersen released a new collection of poems,
The Cat Prince & Other Poems, some of whom were written during the extensive work on
Boy Friends. The poem "The Cat Prince" was shortlisted for the 2023 Forward Prize for Best Single Poem (Performed), In July 2024, Pedersen was announced as the new Edinburgh
Makar, taking over the role from
Hannah Lavery. Pedersen released his debut novel,
Muckle Flugga, in May 2025. ==Personal life==