Marko Kassl (Klagenfurt/Austria) has chalked up a number of notable successes at international competitions – he was awarded a scholarship by the Richard-Wagner-Verband and a sponsorship award from GWK Münster/Westphalia. The winner of the Austrian Accordion Competition, he was also a price-winner in the JAA Accordion Competition in Tokyo and the international Pro Loco Camalò Competition in Italy. As soloist and chamber musician Marko Kassl performed at festivals and venues like Grachtenfestival Amsterdam, Ankara Festival, Mersin Music Festival, Donaueschinger Musiktage, at the Duisburg Theater, Philharmonie Essen, Köln Philharmonie, Festival Musica Eterna Dubrovnik, Chamber Music Festival Utrecht and Ljubljana Festival. 

Marko Kassl recorded for radio-stations like Deutschlandradio, WDR (both Germany), TRT (Turkey), Ö1 (Austria), RTV Slovenia and Concertzender, Radio4 (the Netherlands). He is intensively collaborating with internationally acclaimed composers in order to create and enlarge the repertory for his still young instrument.

He teaches at Detmold Academy of Music in Germany. From 2015 on he leads an accordion class at the Conservatorium van Amsterdam.

Met Black Pencil treedt Marko op zondag 29 maart 2020 op in de kerk van Mook.