Jeroen Thesseling, born 13 April 1971, followed his first classical violin lessons at the age of 7 and
started his study bass guitar in 1988 at the Conservatory in Enschede, the Netherlands. After playing
jazz in his late teenage years he collaborated with the Dutch group PESTILENCE from 1992 till 1994,
recording their jazz/ fusion-influenced album 'SPHERES' (1993). Always willing to experiment and to deepen
his knowledge of other genres, he began studying microtonal music in 1995 that resulted in recording
'HAFNIUM' - study in 72-tone equal temperament (1999) and 'ARGON' - study in 18-tone equal temperament (2000).
The period following, contemporary classical music inspired him to focus mainly on fretless bass. In 2005 he
recorded with the studio quartet ENSEMBLE SALAZHAR. From 2007 till 2011 he collaborated with the German group
OBSCURA, recording the albums 'COSMOGENESIS' (2009) and 'OMNIVIUM' (2011). During the period 2009-2012 he
rejoined PESTILENCE after a 15-year break, recording the album 'DOCTRINE' (2011). Since 2011 German bass
luthier WARWICK built fretless 7-string instruments for him that are strung with a sub-contra F#-tuning.
Late 2014 he founded SALAZH TRIO together with Dutch pianist/ keyboard player Hans Grotenbreg and South-Korean
drummer SunMi Hong. The group is currently working on their debut album.