Thomas studied chapel music under Grabner and Straube in Leipzig and structure under Arnold Mendelssohn in Darmstadt. In 1921, he became an trainer of theory in the Leipzig Conservatory and in 1928 the choir expert in the Institute of Chapel Music. He continued to a recognized profession in choir teaching and performing and teaching, keeping articles in Berlin, Frankfurt, Detmold, & most notably as movie director from the Thomaskantorei as well as the Thomasschule in Leipzig from 1955-61. In 1961, he remaining East Germany for Cologne to immediate the Cologne Bach Culture concerts and finally to come back to his older post in Frankfurt. His textbook Lehrbuch der Chorleitung (Textbook for Choral Performing) continues to be considered a vintage focus on the subject.