Varied racer in sportscars and rallies, who also raced in hillclimbs and touring cars; Keller was frequently seen on the circuits between 1969 and 1977. He raced in a varying amount of machinery, disciplines and countries, but by and large was seen in a Porsche, mainly a Carrera 911 RSR or a 911 S. Amongst the more notable wins to his credit were a win at the 1973 6 hours of Monza, a win in 1973 at the European GT Championship at Estoril and the Jarama 4 Hour race of 1975. As well as all this, he ran his own transportation company in Schaffhausen.

Biography last updated 18 Aug 2017