Klaus was born in 1966 in Hallein near Salzburg. He passes the master craftsman examination in Innsbruck and opened the workshop, specialized on the double basses, in Hallein in 1999. Instruments after Antony Posch, Johann Joseph Stadlmann and Michael Ignaz Stadlmann (Vienna), Andreas Ferdinand Mayr, Ulrich Rämhardt and Jakob Schönfelder (Salzburg) as well as Domenico Busan (Venice) are part of his repertoire.