When my career as concertmaster of the Vienna Symphony Orchestra and the Vienna Philharmonic came to an end, I began holding classes at the Academy (today University) of Music and Performing Arts in Vienna. At 23 years old, I was the youngest teacher since Joseph Boehm, the founder of the Viennese School of violin playing. I was professor at the University from 1963-2009, with many of my students winning international prizes. Many have also become concertmasters of important orchestras, professors at music academies or universities or have made their careers as soloists and chamber musicians.

In 1993, my colleagues from the Alban Berg Quartet and I became Guest Professors at the Cologne University of Music, as successors to the Amadeus Quartet. Our students included some of the best young European chamber music ensembles, such as the Artemis Quartet, the Belcea Quartet, the Casals Quartet, the Fauré Quartet, the Minget Quartet, Trio con Brio, the ATOS Trio, the Morgenstern Trio etc.

After the Alban Berg Quartet's final concerts in 2008, I became head of the string department at the Instituto International de Musica de Camara at the Escuela Superior de Musica Reina Sofia de Madrid. Since 2008, young quartets from Europe, the USA, Japan and China travel to study with me at this Iinstitute. Among them are international prize winning Quartets such as the Acies, the Amaryllis,  the Cavaleri, the Finzi, the Piatti, the Jubilee, the Schumann, the Goldmund, the Calidore, the Meccore, the Aris, the Tchalik,  the Van Kuijk, the Voce, the Vision, the Simply,  the Leonkoro, the  Barbican, the Fibonacci  ect. etc.

In addition to this, I am a visiting professor for master classes at 'ProQuartet' in Paris and at the Schubertiade in Schwarzenberg - Austria, the Schleswig Holstein Music Festival - Germany, the International Institute "MISQA" Montreal, and at the Britten Pears School in Aldeburgh, England. Furthermore, I hold lessons at the Accademia Chigiana in Siena and at thr Academia Stauffer in Cremina