Stefan Kaufmann was born August 4, 1960, Solingen, Germany. He joined Accept as drummer early enough to appear on the cover photos for their debut, but too late to record the drums for the album (that was done by Frank Friedrich). He had to give up drumming towards the end of Accept's career due to health problems.
Kaufmann has produced the live albums Staying a Life and All Areas - Worldwide for Accept and contributed significantly to Accept's songwriting. He has worked extensively as a record producer for other bands. He produced or co-produced every U.D.O. album from 1990 until present.
Kaufmann was the drummer for Accept on nine albums.
Stefan Kaufmann joined Accept's singer Udo Dirkschneider in his band U.D.O. as guitar player in 1996, following Accept's second breakup, and has recorded seven albums with them. On 13 September 2012, it was announced that Kaufman has ceased playing in U.D.O. for "health reasons", though he will continue to work with the band in other capacities.