He was editor for the newspaper Morgenbladet from 1920 until his death in 1949, except for a period in German prisons during World War II.
After half a year he was hired in Høires Pressekontor, a centralized office that helped conservative newspapers with articles.
Following the milk strike in September 1941, he was arrested for "anti-German sentiments" and sentenced to fifteen years in jail.
The accusations of lacking such goals stemmed from the party's attitudes to the Union between Sweden and Norway.
[4] After the war Gjerløw became less of a Conservative Party supporter; he advocated broad political cooperation and was against NATO membership.