 From 2009 to 2011 he was engaged at the National Theater Mannheim performing Gurnemanz, Hagen, Hunding, Fafner, Veit Pogner, König Heinrich, Basilio, Timur, Sparafucile, Sarastro, Baron Ochs, and Osmin.He sang as a guest at the Dutch National Opera in Amsterdam, in Lausanne, at Theater Bonn, at Aalto Theater in Essen, and at the Opera Bastille in Paris.In 2004, the British composer Gavin Bryars wrote two pieces for choir and bass soloist especially for Rúni Brattaberg which were first performed in London in November of that year.