He began as an attaché at the Ministry for Foreign Affairs in 1943 and served in key postings in Washington, D.C., London, and Stockholm, where he was promoted to first secretary in 1953.
As ambassador, Andersson represented Sweden in Abidjan (1963–1967), Wellington (1967–1969), Jakarta and Manila (1969–1973), and Kinshasa (1979–1982), with accreditations to several African nations.
[2] He graduated as a reserve officer in 1939 and received a Master of Social Science degree from the Uppsala University in 1943.
[1] From 1964 to 1967, Andersson served as ambassador in Abidjan, Ivory Coast, with additional accreditations to Dahomey, Mali, Niger, and Upper Volta.
[4][5] In November 1982, he was reassigned to the Foreign Ministry in Stockholm while retaining his ambassadorial position in Kinshasa and other accredited posts.