Danielsen Lie made his film debut when he was 11 years old in the title role of Herman (1990) by Erik Gustavson. He is best known for his leading roles in multi-award winning Reprise (2006) and Oslo, 31 August (2011) by Danish-Norwegian Director Joachim Trier. Oslo, 31 August was selected for Un Certain Regard at the 2011 Cannes Film Festival.
On 11 April 2011 Danielsen Lie released This is autism., a concept album with music written, performed and produced by himself, loosely based on recordings from his childhood.
