 He also acted as a juror for international piano competitions such as the Arthur Rubinstein International Master Piano Competition and also joined in the design of the Vienna Beethoven Competition initiated by Josef Dichler and Richard Hauser.Graf interrupted his teaching career in Vienna twice (1971/72 and 1974/75) to accept a visiting professorship at the Jacobs School of Music at Indiana University at Bloomington.After heart surgery in 1985 he was forced to limit his concert appearances.