JSL (aka RUF) is part of Copenhagen's bass music focused OHOI! crew and runs the bass music label Kraken Recordings, established 2007 as part of the early state of the Dubstep movement.

DJ'ing since 1994, JSL has gigged every venue worth mentioning around Copenhagen, several other danish citys, Roskilde Festival and some european venues as well.

JSL started producing music around 1991 building wierd (ie. very poor sounding) "beats" on a Amiga 500, using the much loved programme, Sound Tracker.
Since then he has had numerous releases on various labels as both producer, rapper and remixer in genres like Hip Hop, House, Reggae, Dub, Techno, UK Garage and Dubstep.

OHOI! - Won: "Best Event", Danish DeeJay Awards 2013
Nominated: "Best Danish Urban Release", Danish DeeJay Awards 2011.
Nominated: "Best Remix", Danish DeeJay Awards 2010.
OHOI! - Won: "Best Promoters", Danish Club Awards 2010.
Kraken Recordings 001 - nominated: "Danish Upfront Release", Danish DJ Awards 2008.