Originally educated as a photographer, Rúni Brattaberg realised in his late twenties that his true vocation might be singing. Studies at the Sibelius Academy in Helsinki and at the Opern Studio in Zürich subsequently led to his employment at the Nationaltheater Mannheim and later at the Leipzig Opera where his great bass voice was heard in many major bass roles. Further engagements saw him at the Opéra Bastille Paris, National Opera Amsterdam and elsewhere.
Substituting for the indisposed Kurt Rydl, he sang the role of Baron Ochs under the baton of Sir Simon Rattle in Amsterdam in 2013.
His successful debuts at the Metropolitan Opera New York and at the Lyric Opera Chicago followed in 2013.