Sigtryggur was born in Norway to Icelandic parents. He was a founding member of the Sugarcubes and has been a longtime fixture on the Icelandic punk and alternative music scene. Other bands he has played in have included Þeyr, KUKL, Headpump,Bradley Fish and the Reptile Palace Orchestra. He has also recorded under the name of Bogomil Font.
Sigtryggur also has a number of filmography-related accomplishments to his credit, including soundtracks for One Point O (2004) and Takedown (2000), acting as the Drummer in Monkey Drummer (2000), and working as a sound recordist for an episode of the documentary television series Naked Science. Sigtryggur is one of the members in the Cassette Iceland collective.