[2] He began playing the double bass during his time studying history and Spanish at the University of Iceland.

His first composition on record appeared in 1982 with the jazz group Nýja kompaníið on the album Þegar kvölda tekur.

[3][5] A techno remix of the albums was made in 2007, RommTommTechno, produced by President Bongo from the Icelandic electro-group GusGus.

[3] In 2011 Tómas wrote the music to the documentary film about the Icelandic writer and Nobel prize winner Halldór Laxness.

Tómas has translated works by several Latin American authors such as Isabel Allende, Gabriel García Márquez, and Julio Cortázar.