Education
University of Oslo.
University of Oslo.
He wrote four volumes of Det norske folks liv og historie (1930-1935), was main editor for the three volume work on Norway"s role during World World War II, Norges krig 1940-1945 (1947-1950), and wrote a five volumes work on the period from 1814 to 1836, Det frie Norge (1951-1962). From 1936 to 1947 he chaired the Norwegian Historical Association. During the occupation of Norway by Nazi Germany he was imprisoned in Bredtveit concentration camp from 15 October 1943, then in Berg concentration camp from 22 to 25 November 1943.
