Background
Lange-Nielsen was born in Eivindvik in Gulen. The son of physician Johan Fredrik Nielsen and Christine Lange.
Lange-Nielsen was born in Eivindvik in Gulen. The son of physician Johan Fredrik Nielsen and Christine Lange.
Lange-Nielsen finished his secondary education in 1908, and attended the Norwegian Military Academy in 1909.
He actively took part in social academic life. He chaired the Norwegian Students" Society in 1916. He graduated as candidate.real. in 1917, and subsequently studied mathematics in Lund and in Paris.
He was manager of the statistics department of De norske Livsforsikringsselskaper from 1920 to 1938, and edited the journal Norsk matematisk Tidsskrift from 1924 to 1929.
He also lectured in mathematical subjects at the University of Oslo. From 1938 to 1945 he worked for the Norwegian Public Service Pension Fund, but was arrested by the Germans in December 1941 because of his participation in the Norwegian resistance movement, and did not return to the Pension Fund until 1945.
He was imprisoned at Møllergata 19, and then incarcerated at the Grini concentration camp from January 1942 to May 1943. While at Grini, he took part in what has been described as the first actual political discussions in the camp, along with Erling Bühring-Dehli, Olaf Solumsmoen and others
From 1945 to 1964 he was chief executive of the insurance company Norske Liv.
He was elected to several governmental commissions, including Pensjonslovkomiteen of 1935, Krigpensjoneringsutvalget of 1940, and Livsforsikringskomiteen of 1947.
He was among the editors of the Norwegian Students" Society"s magazine Samfundsbladet, and he was a board member of the society in the autumn of 1913, at the society"s Centennial Anniversary. He was among the first members of the Norwegian Academy for Language and Literature from its foundation in 1953.