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1989 – 1995
Conservatory Bratislava (voice – Zlatica Livorová)
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1995 – 2000
Academy of Performing Arts Bratislava (Zlatica Livorová), later occasional cooperation with Marga Schiml and Paola Molinari
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1997 – 1999
member of Bratislava Chamber Opera
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since 1999
soloist of the Opera of the Slovak National Theatre
Otokar Klein attended several performing master classes of renowned foreign vocal pedagogues. He is a popular opera and concert artist. He regularly performs on international stages: State Opera Budapest, Vienna State Opera, Zurich Opera, Dresden State Opera, Opéra de Nice, Théâtre Royal de la Monnaie Brussels, Teatro Comunale Bologna, Teatro di San Carlo Naples and many others.
Latest successes include: Almaviva, The Barber of Seville in Vienna State Opera; Lindoro, Rossini, The Italian Girl in Algiers in Sächsische Staatsoper Dresden; Jeník, Smetana, The Bartered Bride in Zurrich, Ernesto from Donizetti's buffa Don Pasquale in Opéra de Nice; tenors part in Orff's Carmina Burana in Teatro Regio Turin, tenor part in Beethoven's Missa Solemnis (Dresden Philharmonic).
Cooperation with world-famous conductors: Daniel Barenboim, Fabio Luisi, Rafael Frühbeck de Burgos, Jerzy Semkow, Ralf Weikert and others.
In his hometown Nové Zámky he regularly organizes an opera gala concert called Otokar Klein and Guests.