Background
He was born in Tjeldsund as the son of coastal pilot Magnar Berg-Sæther (1876–1948) and wife Magna Toresen (1881–1952).
He was born in Tjeldsund as the son of coastal pilot Magnar Berg-Sæther (1876–1948) and wife Magna Toresen (1881–1952).
He was educated in England from 1939 in languages and economics.
After the war he was hired in the Ministry of Local Government and Labour, where he was in charge of integrating refugees from Finnmark from 1946 to 1952. He chaired his Labour Party chapter from 1945 to 1952, and was first elected mayor of Sandtorg in 1947 and held this office until 1963, when the municipality was incorporated into Harstad. Bjarne Berg-Sæther chaired several public boards, including Vågsfjord Kraftselskap (1956–1975), the Evenes Airport building committee (1964–1967), Harstad Hospital (1969–1976), the public transportation company Harstad Oppland Rutebil (1964–1986), Fiskernes Bank and later Kreditkassen Bank in Harstad (1975–1986).
He held the Office manager and Chief Financial Officer positions at Trondenes Kraftverk and Sør-Troms Elforsyning A/South power companies for 32 years (1954-1986)
He died on the 5th of August 2009.
He then sat as mayor of Harstad from 1963 to 1967, and continued as a member of the municipal council until 1975. He was a member of the Troms provincial council from 1947 to 1963, and served as the mayor of the Troms province from 1963 to 1967. He served as a deputy member of the Norwegian Parliament during the terms 1965-1969 and 1969–1973.
In total he met for 347 working days in Parliament.
He was a member of the National Postal Advisory Board (1978–1986) and vice chair of Niingen Kraftlag (1980–1990).