Mathisen is a graduate of the Jazz program at
Trondheim Musikkonservatorium (1990–92). He contributed on
Brinck Johnsen's
Lover man (1995). In the band Quaternion he cooperated with
Jarle Vespestad (drums),
Finn Guttormsen (bass) og
Arve Henriksen (trumpet) (
Timbuktu, Turn Left 1997), and appeared in a duo with
Halvard Kausland on the album
Good bait (2003), Composed music for
Bent Hamer's film
Kitchen Stories (2003). He also contributed on
Kåre Conradi's
La det sne with
Nora Brockstedt (2004), as well as
Conradi's own
God Dag (2005), and are working as an arranger for
Kringkastingsorkesteret KORK,
Marinemusikken and various other big bands and orchestras. == Honors ==