Koppler, Inhaber einer Konzertagentur
Made his Metropolitan Opera debut in Verdi's "Otello", singing the title role under legendary Italian conductor Arturo Toscanini. Toscanini was at the Met from 1908 to 1914, and Slezak sang Otello each time that Toscanini conducted it there.
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Ensemble member of the Berlin State Opera (1898-1900), the Vienna State Opera (1901-1926). Retired from opera in 1934 to devote his time to film acting.