Gall worked for Paul Troost and he designed a new chancellery for Munich. He was assistant to Troost on the Third Reich's first major architectural project, the House of German Art. After Troost's death in 1934, Gall took charge of the project alongside Troost's widow Gerty. He was named on the Gottbegnadeten list of artists valuable to the Nazi regime in 1944.
- Sherree Owens Zalampas (1990), Adolf Hitler: A Psychological Interpretation of His Views on Architecture, Art and Music, Bowling Green State University Popular Press, pp. 76–77, ISBN 087972-487-0