Knudsen had moved to Asker where he became deputy mayor.[2] He was elected as a deputy representative to the Parliament of Norway from Akershus during the term 1965–1969, albeit without being present in parliamentary session.[3] He served as county mayor of Akershus from 1969 to 1975. Among others, he oversaw the creation of Stor-Oslo Lokaltrafikk. Knudsen, who received honorary membership in the Labour Party, died in late 2022 at the age of 91.[2][better source needed]