He was headmaster at Vestoppland Folk High School from 1906 to 1939. He was a member of the Parliament of Norway from 1916 to 1918. He was a chairman of Noregs Mållag from 1917 to 1921. He co-founded of the organization Norske Museers Landsforbund, a forerunner of Norges Museumsforbund, in 1918. In the 1930s he was a member of the council of Norges Forsvarsforening.
- Engen, Arnfinn. "Olaus Islandsmoen". In Helle, Knut. Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 3 August 2010.
- "Olaus Islandsmoen". Store norske leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 3 August 2010.
- Graff, Rolf (1936). Forsvarsforeningen i Norge gjennem femti år 1886–1936 (in Norwegian). Oslo: Grøndahl & Søn. pp. 141–142.
|Chairman of Noregs Mållag
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