Tom Rune Andersen (born 18 October 1976), also known by his stage name Galder, is a Norwegian guitarist and vocalist. He is from the small town of Jessheim, north of Oslo. He is a founding member of the melodic black metal band Old Man's Child[1] as well as the lead guitarist of Dimmu Borgir from 2000 to 2024.[2] In 1993, under the stage name Grusom, he, Jardar, and Tjodalv created Old Man's Child.[1] On Old Man's Child albums, he has performed vocals, guitars, bass, and keyboards, though with a full line-up, his primary instruments are guitar and keyboards, as well as vocals. He joined Dimmu Borgir in 2000 but has kept Old Man's Child active.
Galder has also worked with other Norwegian bands such as Dødheimsgard.[3] A member of Dødheimsgard, Aldrahn, wrote some of the lyrics for Old Man's Child's demo album In the Shades of Life.
Galder has two sons, Alex and Kevin, who are listed in the credits of Slaves of the World.