He began his career with the New Orleans Opera Association in secondary parts, including appearances in Salome (1949), Le nozze di Figaro (1956), Il trovatore (opposite Herva Nelli, 1958) and The Beggar's Opera (directed by Lillian Gish, 1958).
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In 1973, Theyard sang in Manon Lescaut at the Spoleto Festival, with Nancy Shade and directed by Luchino Visconti.
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He went on to sing in the world premieres of Ward's The Crucible (starring Chester Ludgin), Floyd's The Passion of Jonathan Wade (with Phyllis Curtin), and Menotti's The Most Important Man (conducted by Christopher Keene).
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