Born In Kalundborg, Denmark 1972. A graduate of the National Film School of Denmark (2001), he worked in lower positions on a number of Danish films before producing his first hit movie, Nynne (2005), a comedy directed by Jonas Elmer. He then produced and directed the social realist drama Råzone (2006), which was nominated for a Bodil Award as Best Film, and nominated for two Robert Awards as Best Children/Family Film, as well as for Best Director. His short film the critically acclaimed Om natten (2007), which he wrote and directed, was nominated for an Oscar as Best Short Film (2008, Live-Action). Christiansen made his Hollywood debut with the critically panned thriller The Roommate (2011).