[5] He graduated from Stockholms stads handelsgymnasium in 1947 Swahn was a reporter for the Associated Press from 1948 to 1950 as well as for the newspaper Arbetaren and Sveriges Radio from 1950 to 1953.

[3] Swahn worked as a music critic for the newspaper Stockholms-Tidningen from 1953 to 1957 and studied at the University of Minnesota in the United States in 1955.

He was a PR man for Svensk Filmindustri in 1957 and opera and ballet critic for the journal Scen och Salong from 1957 and culture reporter for Sveriges Radio from 1960.

[7] He was TV host for Riksronden, På minuten, Babbel, Halvsju, Gäster med gester (Give Us a Clue), Razzel and Blåsningen.

Two weeks before his death Swahn changed his address to Bonnier's summer house in Tyresö, where he spent much of his final time.