
While at The Juilliard School, he sang the Commendatore in Don Giovanni and Pluton in Hippolyte et Aricie. He joined Lyric Opera of Chicago’s Lyric Unlimited for its production of Perla’s An American Dream. He is a former Gerdine Young Artist of the Opera Theatre of Saint Louis, at which he sang Count Ceprano in Rigoletto and covered Figaro in Le nozze di Figaro. As an ambassador for Opera for Peace, he sang Verdi’s “O tu Palermo” from I vespri siciliani for that organization’s digital concert celebrating World Opera Day 2020. Su has sang Angelotti in Tosca with Austin Opera and Sarastro in Die Zauberflöte, Basilio in Il barbiere di Siviglia, and Garibaldo in Rodelinda, all role debuts, at the Aspen Music Festival. He made his company debut as the Usher in Rigoletto his performances of Sparafucile in outdoor presentations of the opera were cancelled by the COVID-19 pandemic. While a member of the Houston Grand Opera Studio, he also sang excerpts of Enrico in Anna Bolena and the Commendatore in Don Giovanni in the Studio Showcase and later presented Schumann’s Liederkreis Op. He also made his Metropolitan Opera debut as the Jailer in Tosca and, in the summer was a member of the Académie Vocal Residence at the Festival d’Aix-en-Provence at which he sang the Demon in Pergolesi’s Li prodigi della divina grazia nella conversione e more di San Guglielmo Duca di Aquitaina with Les Talent Lyriques. Last season, in his final year of the company’s prestigious Studio, he sang Zuniga in Carmen, the First Officer in Dialogues des Carmélites, Second Armed Man in Die Zauberflöte-while also being responsible for Sarastro, Mandarin in Turandot-while also being responsible for Timur, and the Duke of Verona in Roméo et Juliette. Future seasons see further returns to Houston Grand Opera. He makes role debuts as Blitch in Susannah for Opera Theatre of Saint Louis and Colline in La bohème in his debut with Boston Lyric Opera.

In the 2022-23 season, he returns to the Metropolitan Opera as the Speaker in the company’s beloved English presentation of The Magic Flute, Austin Opera for Basilio in Il barbiere di Siviglia, and Houston Grand Opera for the First Nazarene in Salome. Heralded by the New York Times for “musical taste, honest execution of Handelian ornaments and bel canto filigree, and a solid voice,” William Guanbo Su is a 2019 Metropolitan Opera Laffont Competition Grand Finals winner.
