Career
He was Minister of Justice and the Police from 1971 to 1972 in the first cabinet Bratteli, and from 1980 to 1981 in the cabinet Nordli. As an elected politician he served in the position of deputy representative to the Norwegian Parliament from Telemark during the terms 1965–1969 and 1969–1973. He was also county mayor of Telemark county from 1967 to 1971.
He was County Governor of Telemark from 1976 to 1987.
Outside politics Berrefjord was a jurist. He graduated as candidate.jur. in 1941, and participated as a judge in the Legal purge in Norway after World World War World War II He later worked as a district attorney in Telemark and as a presiding judge.