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1974
member of the group Prúdy (Streams) ofPavol Hammel
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1976
cooperation with Gabo Jonáš and his group Sagittarius
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1978
member of the group Collegium Musicum
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1979
cooperation with Ladislav Gerhardt
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1981 – 1984
member of the group Jazz Q of Martin Kratochvíl
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1982
leader of the group Esprit oriented to fusion music
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1983, 1985
performances at Bratislava Jazz Days (with Esprit)
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1984
Esprit performance at Bratislava Jazz Days and International Jazz Festival in Prague
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1987 – 1992
Berklee College of Music in Boston (composition)
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1990
founder of the group Boston Drivers in USA (Ch. Hahn – keyb, Sal DiFusco – gui, Pat Loomis – sxa, Matthew Garrison – bgui)
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1991
cooperation with Polish singer Grazyna Auguscik
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1992
performing at Bratislava Jazz Days (with Esprit)