Borgenstierna served at the Consulate General in
London in 1927 and at the Swedish legation in
Paris from 1928 to 1930. He served as ''chargé d'affaires ad interim
in Lisbon in 1942, was appointed legation counsellor in Buenos Aires in 1944, and became chargé d'affaires'' in
Montevideo in 1949. In 1953, he was appointed envoy to
Caracas,
Havana,
Ciudad Trujillo, and
Port-au-Prince. From 1958 to 1963, he served as ambassador to Buenos Aires and envoy to
Asunción. He participated in trade negotiations with Argentina, Cuba, Spain, and Uruguay; in aviation negotiations with Argentina and Uruguay; and in visa negotiations with Argentina and Paraguay. During his time in South America, he made significant contributions not only in the field of trade policy but also in cultural affairs. He organized large-scale donations of Swedish books to Argentina, played an active role in the establishment of Casa Suecia in Buenos Aires, and was deeply involved in promoting Swedish arts and crafts through exhibitions for South American audiences. He subsequently served as ambassador to
Madrid from 1964 to 1968. He later served as Chairman of
Atlas Copco S.A. Española, honorary chairman of Ciudalcampo, and honorary member of the City Council of
Málaga. ==Personal life==