Subsequently, he worked and studied with Ludwig Gies, first at the School of the Museum of Decorative Arts (Unterrichtsanstalt des Kunstgewerbemuseums), then in 1935, as a master student at the Vereinigten Staatsschulen für Freie und Angewandte Kunst (VSS), the State School of Free and Applied Arts in Berlin.

[4] In 1941, he was drafted to serve in the Wehrmacht,[1] where, risking great danger, he published a leaflet called "Open Letter to the Eastern Front," in 1942.

[1] In protest of the National Socialist attack on Gies, Schumacher resigned his privileged position as master student.

During Schumacher's arrest on 12 September 1942, the Gestapo destroyed his studio in Berlin, including a large amount of his artwork.

There is a 1941 painting by Carl Baumann called "Rote Kapelle Berlin" at the Academy of the Arts (Akademie der Künste), where Schumacher's Resistance group often met.