Finnmark then served at the Organisation for European Economic Co-operation (OEEC) in Paris in 1949, was extraordinary first secretary in 1952 and extraordinary first secretary with embassy counsellor's position at the delegation of the European Coal and Steel Community in Luxembourg in 1952.
He became first secretary in 1956 and served at the United Nations Secretariat in New York City from 1956 to 1958 and was acting embassy counsellor in Paris from 1958 to 1961.
[1] He served in Moscow from 1961 to 1964, had minister's position in 1963, was ambassador in Karachi and Rawalpindi from 1964 to 1969, Belgrade and Tirana from 1969 to 1975, New Delhi and Dhaka from 1975 to 1977 as well as Colombo and Kathmandu from 1975 to 1983.
[2] Finnmark was sent to Korea to try and resolve the crisis over the North Korean capture of the United States Navy intelligence ship, the USS Pueblo.
[3][4] Finnmark was secretary representative and chairman of bilateral trade negotiations and representative at the General Agreement on Tariffs and Trade (GATT) and the United Nations Economic Commission for Europe (ECE) in Geneva in 1947 and was chairman in aid policy negotiations with India and Pakistan in 1964.