In the rock/pop field, he has collaborated with artists such as Gianna Nannini, Middle of the Road, Lynn Anderson, Helmut Zerlett, Kimberley Dahme, Jon Walmsley and Johan Eliasson among others. In the jazz field, he has also worked with Wolfgang Lackerschmid, Bill Molenhof, Claus Stötter, Jörg Widmoser, and many others.
As a musician/producer, he has collaborated on numerous CD releases and has participated in countless international music festivals with a variety of artists.From 2006 to the present, Stephan is the drummer and programmer of the world-renowned Scottish band Middle of the Road, and he is currently touring with this band throughout Europe. In 2007, he started working with Gianna Nannini; first in studio and finally on stage. The Pia Come la Canto Io Tour was followed by over 60 concerts of the Giannabest Tour in 2008.