[2] The Ásatrúarfélagið ("Fellowship of Æsir faith"), which he co-founded in 1972, and for which he acted as allsherjargoði, was officially recognised as a religious body in 1973.

He sometimes performed at rock concerts and is the opening act in the film Rokk í Reykjavík, directed by Friðrik Þór Friðriksson.

In 1982 Sveinbjörn released an album, Eddukvæði (Songs from The Poetic Edda), in which he recites in rímur style 75 stanzas from Hávamál, Völuspá and Sigrdrífumál.

The album, on the Gramm label, included a booklet of the poems in Icelandic, with translations into English, Swedish, and German.

[3] His sister, Halldóra B. Björnsson, translated Beowulf into Icelandic as Bjólfskviða, "The Lay of Bjólfur" in 1968; a version was published in 1983.