Müller was born in Biel/Bienne, Switzerland, and attended the Farbe und Form (F+F) in Zurich from 1982 to 1983, where he studied Fine Arts and graphic design.
From 1984 to 1989, he studied Fine Arts at the Kunstakademie Düsseldorf, where he was a Master Student of Prof. Fritz Schwegler and Tutor to Prof. Kasper König.
[1] The next year, he had his first solo museum exhibition, Fixed Values (1991), at the Palais de Beaux-Arts, Brussels.
[2] In 1993, the commissioner of the 45th Venice Biennale invited Gerwald Rockenschaub to represent Austria alongside non-Austrians Müller (Switzerland) and Andrea Fraser (USA).
[3][4][5] The work was a comment on transgressing national borders, which he physically enacted by illegally hiking across Austria’s borders with the Czech Republic, Slovakia, Hungary, Slovenia, Italy, Switzerland, Liechtenstein, and Germany.