Guðmundur graduated from the Reykjavik College of Music 1986 with a performance diploma and received a UM diploma 1990 from Brabantsconservatorium de Tilburg, Holland. He has appeared in numerous performances in Iceland and abroad as a member of the Bernardel string quartet, the ETHOS string quartet and the Cammerarctica chamber group. Guðmundur teaches at the Reykjavik College of Music and has been a member of the Iceland Symphony Orchestra since 1990. He has appeared as a soloist with the orchestra. Guðmundur received an artist grant from the Icelandic government 2000 – 02.