Norwegian music composer who served as the initial director from the Norwegian Concert Institute and was taken into consideration a neoclassicist and expressionistic. His initial composition to become played in public areas was his Trio for Strings, Opus 3, which debuted on the Youthful Nordic Music Celebration in 1950. He trained composition on the Oslo Conservatory of Music from 1973. He was the kid of the Oslo publisher called Ernst Gustav Mortensen. He was much less well-known than fellow Norwegian composer Edvard Grieg.