Daniels made his professional singing debut in 1992. In 1997, he won the Richard Tucker Award. In 1999, he made his debut with the Metropolitan Opera, as Sesto in Handel's Giulio Cesare. His repertoire has grown to include other major Handel roles, including Arsace in the comedy Partenope at the Lyric Opera of Chicago and San Francisco Opera in 2014; the title role in Tamerlano; and Arsamene in Xerxes. At the Bavarian State Opera in Munich, Daniels played the title roles in Rinaldo and Orlando, as well as David in Saul. He interpreted Ottone in Monteverdi's L'incoronazione di Poppea and recorded the role of Nero in the same work; it was also his debut role at San Francisco Opera in 1998. In Vivaldi's operaBajazet, he sang the role of Tamerlano. In 2013, he sang the title role in Giulio Cesare at the Metropolitan Opera. Daniels has also branched out from the baroque roles usually associated with countertenors to include Oberon in Benjamin Britten's A Midsummer Night's Dream at the Metropolitan Opera, and as Orfeo in Gluck's Orfeo ed Euridice at the Royal Opera House, Covent Garden. In July 2013 he created the role of Oscar Wilde in Oscar at the Santa Fe Opera, written for him by Theodore Morrison; he then sang Oscar again in Opera Philadelphia's production in 2015. The same year he made his debut at the Vienna State Opera as Trinculo in Thomas Adès' opera The Tempest. In the Fall 2015, Daniels joined his alma mater, the University of Michigan School of Music, Theatre & Dance, as Professor of Music in Voice. On March 26, 2020, at the recommendation of U-M President Mark Schlissel and in a unanimous vote by the Board of Regents, Daniels was dismissed from U-M effective immediately and without severance pay.
Sexual assault allegations
In the fall of 2018, Daniels was placed on leave with the University of Michigan School of Music, Theatre & Dance after allegations of sexual assault were made by a student in August 2018. A second student accused Daniels of sexual assault, and brought civil lawsuits against both Daniels and the University of Michigan, in October 2018. Following this, the San Francisco Opera removed Daniels from its 2019 production of Orlando "after considerable deliberation given the serious allegations of sexual assault." On January 29, 2019, Daniels and his husband were arrested in Ann Arbor, Michigan and face extradition to Texas based on the first student's allegations. On March 26, 2020, at the recommendation of U-M President Mark Schlissel and in a unanimous vote by the Board of Regents, Daniels was dismissed from U-M effective immediately and without severance pay.
Art songs
In addition to his operatic work, Daniels also gives regular recitals, for which he has developed a repertoire that includes 19th- and 20th-century art songs not usually associated with countertenors, including works by such composers as Berlioz and Poulenc.