American baritone Brian Mulligan has become sought out by the world’s leading opera houses and orchestras, singing a unique variety of repertoire from works by Argento, Meyerbeer, Puccini, Spears, Verdi and Wagner. Throughout the past few years, Mulligan has appeared at the San Francisco Opera, Wiener Staatsoper, the Metropolitan Opera, Opernhaus Zürich, Lyric Opera of Chicago, Houston Grand Opera and Oper {…}