 In 1987, Müller was appointed as the chief representative and head of the core division for corporate clients in Frankfurt.He worked in this position until February 1990, when he took on the role of head of the central division for rebuilding former East Germany.Müller became a member of the Commerzbank board of managing directors on November 1, 1990, and was made the spokesman of the board on May 25, 2001.