 He continued musical studies, studying with Franz Volkert and others.Count Ferdinánd Pálffy, director of Theater an der Wien, heard Haizinger sing in concerts, and offered him an engagement at the theatre; Haizinger gave up teaching.Haizinger's first roles at Theater an der Wien, in 1821, were in two operas by Rossini, as Gianetto in "La gazza ladra" and Lindoro in "L'italiana in Algeri".