Stephen Costello was born in Philadelphia. In 2009, he received the prestigious Richard Tucker Award. In 2006, he sang the role of Nemorino (L’elisir d’amore) at the Bordeaux Opera. He made his New York Metropolitan Opera debut in 2007. Over the next few seasons, he made guest appearances at the Salzburg Festival (Cassio in Otello under the direction of Riccardo Muti, DVD Major/Naxos), the Royal Opera House in London (Carlo in Linda di Chamounix, CD Opera Rara), the Lyric Opera in Chicago (Camille de Rosillon in Die lustige Witwe), the Tchaikovsky Concert Hall in Moscow (the title role in Romeo and Juliet), the Glyndebourne Festival (Nemorino), the Vienna Staatsoper, the Berlin Staatsoper and the Los Angeles Opera (Rodolfo in La Bohème), the San Diego Opera (Romeo, the Italian Singer in Der Rosenkavalier, the title role in Faust, Tonio in La Fille du régiment), New York’s Metropolitan Opera (Lord Percy in Anna Bolena alongside Anna Netrebko, and re-broadcast as part of the Met’s Live in HD series), and the Houston Opera (the Duke of Mantua in Rigoletto). In 2014, he performed the role of Alfredo Germont (La Traviata), first at London’s Royal Opera House and then at the San Francisco Opera. In 2016, he appeared in Dallas in Donizetti’s three operas (Maria Stuarda, Roberto Devereux and Anna Bolena) and sang the role of Des Grieux (Manon). He made his Paris Opera debut in 2017 in Die lustige Witwe. During the 2018-2019 season, he made several role debuts, including Don José in Dallas, Rodolfo (La Bohème) in Dresden and Mannheim, Alfredo at the Hamburg Staatsoper, the Verona Arena and in a new production at the Metropolitan Opera, and the Duke of Mantua at the Bregenz Festival and the Metropolitan Opera. He also made his Japanese debut in the role of Pinkerton (Madame Butterfly) and appeared with Anna Netrebko, Elina Garana and Angela Gheorghiu in a concert given in memory of Dmitri Hvorostovsky at the Royal Opera House in London. During the 2019-2020 season, he made his Zurich Opera debut in a stage production of Verdi’s Requiem and sang the role of Des Grieux (Manon) at the Paris Opera.