1969 – 1975
Conservatory Košice (clarinet – Richard Schreiber)
1975 – 1979
Academy of Performing Arts Bratislava (Edmund Bombara)
educational stay in Wigmore Hall, London
1975 – 1991
first clarinet and deputy head of clarinet section at State Philharmonic Košice
1991 – 1997
and since 2003 pedagogue of clarinet at Conservatory in Košice
1996 – 2004
lecturer of master classes: 1996 Greenville, North Carolina, USA, 1998 Peking, China, 1999 a 2000 Avila, Spain, 2003 Ames, 2004 Washington, Vancouver, USA
the head of State Philharmonic Košice
1991 – 2002
member of Culture and Sport Committee of City Košice
1994 – 2000
member of Bratislava Music Festival Commitee
1997 – 1999
member of Artistic and Scientific Council of Music and Dance Faculty of Academy of Performing Arts, member of Administrative Council of Pavol Jozef Šafárik University in Košice
representative of Association of Directors of professional orchestras in Slovakia in PEARLE (Performing Arts Employer Associations League Europe)
member Steerin Committee of European Sectoral Social Dialogue in the live performance, Brussels
Entering State Philharmonic Košice, Július Klein fully developed not only his soloist activity, but also performed with chamber orchestras (member of Wind Quintet and Košice Wind Quintet). As a soloist he cooperated with domestic and foreign music ensembles (Slovak Philharmonic Košice, Slovak Chamber Orchestra of Bohdan Warchal, Slovak Sinfonietta Žilina, State Opera Orchestra Banská Bystrica, North York Symphony, Miskolci Szimfonikus Zenekar, Symphony New Brunswick, Janáček Philharmonic Ostrava, New Tokyo Chamber Orchestra, Cheju Symphony Orchestra, Changwon Symphony Orchestra, Kazan State Chamber orchestra “La Primavera”, Central Iowa Symphony Orchestra).
He was also lecturer (Valncia-Sueca, Spain, USA). He is member of juries of clarinet competitions at home and abroad.
For his creative artistic activity in arts and organizations he has won several awards.