 He was a central person in the establishment of the Norwegian School of Economics, and was appointed professor of political history at the institution from 1946 to 60.His works include his thesis "Kampen om Nilen" from 1923, "Kampen om oljen" from 1925, "Norges Kornforsyning inntil 1914" from 1954, and "De 50 statene" (1959).He wrote three books on the Napoleonic era, "Keiseren av Elba", "De hundrede dager" and "Mot Sankt Helena".