 In Munich, he visited the art collections in the city's two major galleries, the Alte Pinakothek and the Neue Pinakothek).In 1929, he sat and passed the painter's trade examination with the stage decorator O. Möllhoff in Halle.Upon completion of his studies, in 1930 Müller entered employment in the paint factory at the Technische Chemikalien- und Compagnie GmbH in Halle.