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Hollmann's father, also called Hans Hollmann, was well known in and around Graz as a music teacher. His mother was also a teacher. Hollmann attended the Gymnasium (school) in Graz and then progressed to the local university, emerging in 1956 with a doctorate in jurisprudence. He then switched to drama, as he studied at the Reinhardt Seminar at the University of Music and Performing Arts in Vienna. In 1958 he received a diploma in acting.