He worked at the Swedish History Museum, where he was responsible for the finds from the boat graves at Valsgärde, and later at Uppsala University, where he wrote two major works alongside several hundred other publications.
Sune bekerja di Musium Sejarah Swedia, tempat dia bertanggung jawab atas penemuan dari makam kapal di Valsgärde, dan kemudian di Universitas Uppsala, tempat Sune menulis dua karya utamanya selain beberapa ratus publikasi lainnya.