Uruguayan bassist best known for his work as part of the acclaimed progressive death metal band Opeth. He is known to fans for his stoic demeanor and windmill-style headbanging during live performances.
He joined Opeth shortly after the recording of the band's third album, 1998's My Arms, Your Hearse.
He commonly uses fretless Fender jazz basses and started playing in drop D tuning during the writing of Opeth's 2005 album Ghost Reveries.
His son Noak was born in June 2008.
He has been bandmates with Opeth singer and guitarist Mikael Akerfeldt.