A versatile singing actor, Michael Gallup earned praise for more than two decades as a regular guest of a number of opera companies throughout the United States, including the Los Angeles Opera, Dallas Opera, New Jersey State Opera, Michigan Opera Theatre, Opera Pacific, Portland Opera, Seattle Opera, San Diego Opera, Long Beach Opera, Arizona Opera, Anchorage Opera, Dayton Opera, Orlando Opera and Palm Beach Opera.  He has also performed opera at the Hollywood Bowl under Michael Tilson Thomas, Sir Charles Groves and Leonard Slatkin.

Notable roles for Los Angeles Opera (where he has appeared in forty one productions) include Bottom in A Midsummer Night’s Dream, Faninal in Der Rosenkavalier, the Sacristan in Tosca, Trinity Moses in The Rise and Fall of the City of Mahagonny, Doctor Bartolo in Le Nozze di Figaro and Il Barbiere di Siviglia, Taddeo in L’Italiana in Algieri, Don Alfonso in Cosí fan tutte, Dulcamara in L’Elisir d’amore, Zuniga in Carmen, Czar Nicholas II in Deborah Drattel’s operatic adaptation of Nicholas and Alexandra, and Alcindoro/Benoit in La Bohéme.