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1983 – 1989
Mechanical Faculty of Slovak Technical University in Trnava
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1984
took part in Jazz Workshop in Frýdlant
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1986
member of Esprit ensemble
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1987
member of Ján Hajnal Quintet, performed at the Bratislava Jazz Days '87
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1988 – 1989
collaboration with various jazz formations and musicians: Bratislava Trio, Leoš Kuba Quartet, Ba Gang, Andrej Kellenberger Quartet, Jozef "Dodo" Šošoka, Ľubomír Tamaškovič etc.
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1989
performed at the Slovak Jazz Festival in Žilina (solo and with Andrej Kellenberger's Alef ensemble )
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1990 – 1997
State Conservatory in Bratislava, double bass department; private lessons with František Uhlíř and A. Jermin
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1991
emergence of his own ensemble Just Jazz focused on be bop (K. Simonyi – vocals, Ján Štubniak – piano, Juraj Kalász – double bass, J. Varsányi – percussion) since 1992 has performed in concert with his own ensemble Jazz Special
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1993 – 1994
collaboration with Brno musicians and emergence of the ensembles Czechoslovak Quintet (Karel Růžička, S. Mácha, Ľubor Priehradník, Marcel Buntaj), with whom he appeared at the Bratislava Jazz Days '93, and Chamber Jazz Trio (J. Hnilička, Roman Pokorný); member of Tutu ensemble
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1995 – 1996
member of the Polish saxophonist Janusz Muniak's quartet
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1996 – 1997
member of the Shawn Loescher Trio, Láďa Kerndl Jazz Friends, Chamber Jazz Trio, Elie Quintet (Marián Ševčík, Miloš Suchomel, Ľuboš Šrámek, Oskar Török) etc.
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1998
collaboration with Peter Cardarelli Quartet (Peter Cardarelli, Pavol Bodnár, Oldo Petráš), Ľubomír Tamaškovič, Jozef "Dodo" Šošoka, Ján Hajnal, Juraj Henter, Matúš Jakabčic, Juraj Bartoš, Gabo Jonáš, Emil Viklický, Jiří Stivín, Jan Hnilička, Karel Růžička ml., Roman Pokorný, Larry Smith, Toninho Horta, Piotr Wojtasik, Danillo Castellano, Greg Burk etc.
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2012
member of Gabriel Jonáš Trio