Danielson was born in Vittskövle, Sweden. He worked as a firefighter in Kristianstad for three years before film studies at the Valand Academy in Gothenburg. In 2012 he founded the master program Cinematic Processes at the Valand Academy. His graduation film was Summer Clouds (Sommarlek), which won an award at the Tallinn Black Nights Film Festival. He is the co-owner of the production company Plattform Produktion.
Danielson's first feature documentary film Twin Brothers - 53 Scenes in Chronological Order (Pangpangbröder), premiered at the International Film Festival Rotterdam in 2011. In 2016, he co-directed Ten Meter Tower (Hopptornet), along with Maximilien Van Aertryck, which premiered at the Berlin International Film Festival and was shortlisted for an Academy Award for Best Documentary Short film. In 2023, he co-directed And the King Said, What a Fantastic Machine, together with his long-term collaborator Maximilien Van Aertryck, which premiered at the Sundance Film Festival.
