Jeff as been mixing since 1982 beginning to make mix tape montage on Revox A-77 while listening Dr Silk & Danny Le Rouge on Couleur 3 but started it more seriously in 1985 with Funk Music. In 1986, the House of Chigago appeard and the first Acidhouse party were given in Geneva.
In 1988, he decided to focus on Hip Hop. He was particularly intersted in "scratching", wich is a real passion. He won the D.M.C. Championship in Switzerland three times in a row (in 89 - 90 - 1991), took part at the "DMC World DJ mixing championship" in London (9th place) and the European in Amsterdam (6th place). https://www.youtube.com/user/jeffswing/videos
In 1991, the UDM (Underground Dance Movement) contact Jeff and offers him to make a scratching demo on techno music. Jeff accepts and plays during the first UDM partys. At that time, the reference label was "Plus 8 & U.R". The first Olympia party was given at l'Ancien-Palais in 1992 by Jeff & Alex Anthony.
In 1999, Jeff decides to created his new organization Stark. He produces with Dip under the prestigious english label "Primate Recordings" UK with the pseudonym Spectrum. http://www.discogs.com/Spectrum-Pratikus-Atomizer/release/34293 Jeff also performed during the most important events in Switzerland (Weetamix, L'usine, Loft, Goliath, Energy, … ).He also performed next to other famous Dj like Derrick May, Kenny Larkin, Laurent Garnier, Jeff Mills, Sven Vath, Aphex Twin, Marco Carola, Carl Cox, The Prodigy, The Advent,Joey Beltram, Dj Hell, Frankie Bones, Colin Dale, Josh Wink, Eva Cazal, Darren Price, Damon Wild, Trevor Rockliffe, Agoria, Adam Beyer, Luke Slater, Gaetano Parisio, Dave Angel, Thomas Krome, Rush, Marco Bailey, Umek, James Ruskin, …