A true Central European artist, Ottokár Klein has a German name, speaks Hungarian as his mother tongue and holds Slovakian citizenship, in addition to which he also possesses a tenor voice of unusual range and beauty. He studied under Zlatica Livorová both at the Bratislava Conservatory and at the same city's Academy of Performing Arts. In April of 2002, Klein performed in an opera by Cimarosa at the request of the Radio France Philharmonic Orchestra in Paris, and a year later was invited by the Staatskapelle Dresden to be a soloist in Rossinis Stabat Mater. In January 2003, he made a successful debut in Budapest as Arturo in Bellinis I puritani, later also singing this role in Copenhagen in a concert performance with Friedrich Haider conducting. Klein also drew praise for his performance in Smetanas The Bartered Bride, performing it in Bolognas Teatro Communalé, Triestes Teatro Giuseppe Verdi and Salzburgs Grosses Festspielhaus. During the 2005-2006 season, he debuted on three significant opera stages: Dresdens Semperoper (Rossinis L'italiana in Algeri), the Teatro San Carló in Naples (Schuberts Mass in E flat major) and as part of a new production of Boris Godunov at Brussels Théàtre Royal de la Monnaie, alongside José van Dam, among others. Klein made his debut at the Wiener Staatsoper in January of 2005 with an acclaimed portrayal of Count Almaviva in the Barber of Seville. Milan has been one of the most important stops of his recent career, where on the stage of the Teatro alla Scala, under the direction of Daniel Barenboim, he sang one of the character roles for eight performances of Prokofievs The Gambler. This unique production was also included in the Berlin State Opera's 2008 program.