Having joined Audi back in 1990 as an interior designer, Sielaff has previously led Volkswagen's Munich design studio and has also worked for Mercedes-Benz for three years.
He is best known for the current Audi look, particularly the incorporation of LED lights that have become almost standard across the industry.
He has had a major hand in designing the Audi A1, A6, A7 and A8 as well as the Audi e-tron Spyder and the A2 e-tron concepts.
We won't see his design ideas turn into Volkswagen production cars for at least a few years yet, as we see out the last of Thomas Ingenlath's (his predecessor) work before he leaves Volkswagen.
Audi will fill Sielaff's position with Wolfgang Egger, who is currently Audi's head of group design.