Werner was a regular driver in the STW and Porsche Supercup during the 1990s, but he found more success in the 24 Hours of Daytona, which he won in 1995 in a Kremer-Porsche.
Werner var fast kører i STW og Porsche Supercup i 1990’erne, men fik mere succes i 24-timers-løbet ved Daytona, som han vandt i 1995 i en Kremer-Porsche.