Formerly a stage actor and opera singer. Early in his promising career, though, his intense stage fright terminated his ability to either act of sing before an audience.Spent the last years of his life operating a movie theater in Copenhagen, Denmark.While staying at a hotel in Paris, he was staying in a room next to a suite where famous opera singer Enrico Caruso was held up. Through the thin walls, Caruso heard Christiensen singing pieces of an opera to himself in the bathtub. Carouso later approached Christiensen and told him he had the best voice he had ever heard and offered to give him a lead part in his next production. Christiensen, embarrassed, declined the offer, explaining that it was impossible for him to perform before an audience and that his singing voice only returned to him when he was alone and thought that nobody was listening.Biography in: John Wakeman, editor. "World Film Directors, Volume One, 1890-1945". Pages 124-128. New York: The H.W. Wilson Company, 1987.