Simonsen was a member of Århus city council from 1966 to 1997 and mayor from 1 January 1982 to 1997, when he left the position to become Minister of Interior Affairs. Prime MinisterPoul Nyrup Rasmussen had called for a tightening of the laws on immigration and refugee issues that the previous minister Birte Weiss refused to implement and caused her to resign in protest.[1] Although Simonsen was not a member of parliament, he was the problem solver that Nyrup Rasmussen hoped would be able to bring greater clarity to the government's policy on the immigration and refugee issues, issues on which the government had received considerable criticism in particular by the Danish People's Party.[1]
Simonsen died on 4 September 2022, at the age of 96.[2]