Career
He is known for his role in the radio duo Tvíhöfði with Jón Gnarr and for his part in the popular Icelandic television sketch comedy Fóstbræður. He has since written many Icelandic television series, including Svínasúpan (2004), Stelpurnar (2005-2008) and the drama series a (2007-2012), "Réttur" (2009-2010) Réttur was laterpicked up by National Broadcasting Company for an United States remake. In the years 1988 to 1994, he was active in the Icelandic music scene as vocalist and lead guitarist in the metal band HAM. In 1992 he wrote the score for the Icelandic cult film Sódóma Reykjavík.
In 2012, Kjartansson joined Icelandic director Baltasar Kormákur in rebranding his company under the name of RVK Studios, where Sigurjón is now the Head of Development.
The pair have created a new 10 part drama series, Trapped, going into production in the fall of 2014. The show is a co-production between RÚV, DR1 and other European distributors.