He is married to Nina Persson, the lead singer of the Swedish rock band The Cardigans, and the couple has collaborated on several musical projects.

Larson is responsible for arranging 12-hour experimental music concert events, and is one of the founders of the LUMEN PROJECT.

Larson is also credited as co-writer of several songs on The Cardigans' 2005 album (and last to date), Super Extra Gravity.

[6] He has produced albums for The Ark, Angela McCluskey's THE THINGS WE DO (Manhattan / Blue Note), among other work.

In 2017, he was a co-founder of the international nonprofit LUMEN PROJECT,[8] which creates 6-24 hour audio and visual experiences.