Heinz Müller was a German cyclist who won the World Road Race Championship in Luxembourg in 1952.
During his Worlds-winning-ride his mount was a Bauer bicycle fitted with an Altenburger S-O derailleur. Following his victory Bauer launched a new top-end model called the 'Weltmeister' and Altenburger renamed their competition derailleur 'Champion'.
Heinz Müller was born in Tuningen, near Schwenningen, Germany, in 1924. He raced as an amateur for Radsportverein 1906 in Schwenningen and joined the Bauer professional cycling team in 1949. Schwenningen was a world centre of watch making and Frank Berto reports that Heinz Müller was a skilled mechanical engineer. Frank Berto, further, goes on to suggest that Heinz Müller worked with Altenburger, who were based not far away, near Schaffhausen, to develop their derailleur system.
I believe that this image shows Heinz Müller signing his contract with the Bauer cycling team, possibly in 1949.