Eugen Jochum
Haas was an important music teacher. Among his numerous students are composers and conductors, such as Otto Jochum (1898–1969), Karl Gustav Fellerer, Eugen Jochum, Karl Amadeus Hartmann, Karl Höller, Philipp Mohler (1908–1982), Cesar Bresgen, Ernst Kutzer (1918–2008), and Wolfgang Sawallisch, and Margarete Schweikert.