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1960 – 1966
Conservatory Košice (bassoon – Róbert Krajčo)
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1970 – 1974
Academy of Performing Arts Bratislava (Ján Martanovič)
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1966 – 1969
West Bohemian Symphony Orchestra
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since 1969
first bassoon of the State Philharmonic Košice
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1974
founder of Philharmonic Wind Quintet
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1981
founder of Košice Wind Trio
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2000
founder of Philharmonic Wind Trio
For a long time he played in duo with his brother Július Klein (cl) and performed in numerous solo programs and educational concerts (with Slovkoncert Agency Košice and Bratislava).
He recorded characteristic compositions for bassoon solo with the accompaniment of the brass ensemble Dargovanka of Anton Petrík for Radio and Television Košice.