As of 2011, he is responsible for composing the score for the TV series Once Upon a Time. (soundworkscollection.com)
He said that the main difference between composing a score for an online multiplayer focused game compared to a single - player game is simply the differences in gameplay. (gamesauce.biz)
Kjartansson has collaborated with a broad range of musicians, including the National, the Vienna Boys» Choir, Pinetop Perkins, Kristín Anna, Orchestre Métropolitain, and frequently Kjartan Sveinsson, who composed the score for the S.S. Hangover. (schedule.fuseboxfestival.com)