Career
He had to give up drumming towards the end of "s career due to health problems. Kaufmann has produced the live albums Staying a Life and All Areas - Worldwide for and contributed significantly to "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 2011.
Kaufmann was the drummer for on nine albums. Stefan Kaufmann joined "s singer Udo Dirkschneider in his band U.D.O. as guitar player in 1996, following "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. During his tenure with, Kaufmann used Tama drums.
He was also one of the first drummers to use Meinl cymbals when they became widely manufactured and sold in the late 1970s.