Kless began performing at an early age, attaining a world-wide reputation in his activities like soloist and chamber musician. His repertoire includes works from baroque period to compositions specially created for him.
Kless belonged to the Baroque Musicians Israeli Group, and he was the first violin in the Sol-La-Re string quartet, the Tel Aviv piano quartet and the American New Art Trio. He is currently a member of the Modus Trio, a string trio in Israel.
For many years, he has been in charge of the String Department at the Rubin Academy of Music, which he directed between 1989 to 1993. His pupils include Vadim Gluzman.
Kless has served as a jury member of several international competitions. He regularly takes part in summer courses and prestigious music festivals, such as the Salzburg Festival and Bravo! Institute. He is also a guest professor in master classes in the United States, the former Soviet Union, Germany, Ireland, Finland, France, Australia, England, Italy, Poland and the Netherlands. Since 1995, Mr. Kless has divided his time between Europe - as professor at the Graz University (Austria) - and Israel.
||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (August 2009) (Learn how and when to remove this template message)|