He later earned a doctorate from that same school in musicology in 1927 where he trained in that subject under Moritz Bauer.
He then entered the Leipzig Conservatory where he trained as an organist under Karl Straube and continued piano studies with Anna Teichmüller.
[1] Hans Klotz was organist at the Evangelical Church in the Rhineland and director of the Aachener Bachverein from 1928 through 1942.
He was a professor of the organ at first the Lübeck Academy of Music (1950-1953) and then the Hochschule für Musik und Tanz Köln (1954-1966).
He published several academic works on organ music and performance practice, both historical and contemporary.