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1998-2004
Conservatory in Košice (Juraj Šomorjai); during Conservatory studies was soloist of the Opera of State Theater in Košice
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Workshops (Peter Dvorský, Eva Blahová, Ryszard Karczykowsky)
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2007
debut in The Slovak National Theatre with character of Pinkerton in Madama Butterfly
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2008
guest artist in Split's National Theatre (Faust and Nemorino)
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since season 2008/09
soloist of Janáček Opera of the National Theatre Brno
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since 2009
guest artist in National Theatre and State Opera in Prague
Selection of the opera characters: Nemorino (The Elixir of Love), Faust (Faust), The Prince (Rusalka), Alfredo (La traviata), Vašek (The Bartered Bride), Don Ottavio (Don Giovanni), Ernesto (Don Pasquale).
Berger is also devoted to interpretation of oratorial music and regularly cooperates with the Slovak Philharmonic, State Philharmonic Košice, Brno Philharmonic Orchestra, Prague Chamber Philharmonic Orchestra, Bohuslav Martinů Philharmonic Zlín, and as a guest performs in the State Opera Banská Bystrica. As a concert artist he performed at home and abroad.