politician member of the Parliament of Norway
He was elected to the Norwegian Parliament from Hordaland in 1981, and was re-elected on one occasion. Midway through his second term, he died in 1987 and was replaced by Hans J. Røsjorde.
Monsen was a member of the executive committee of Bergen city council in 1979–1983, and of Hordaland county council in 1975–1979 and 1979–1983.