Rafael Kubelík
Hemsley was a notable interpreter of German music, such as Beckmesser in Wagner's "Die Meistersinger von Nürnberg". Otto Klemperer specifically recommended Hemsley to the Bayreuth Festival for the role, which Hemsley sang there 1968 to 1970 and recording it under the baton of Rafael Kubelík. In the latter part of his career, he taught at the Guildhall School of Music and Drama, London and also Dartington International Summer School.