Robert Wagner is an accomplished American classical singer, specializing as both a baritone and tenor, as well as a jazz contrabass player. Born in New Orleans, he began his musical journey at the young age of five, initially playing guitar before transitioning to singing as a boy soprano in St. Dominic's Concert Choir. Following his high school education, Wagner received numerous scholarship offers from various universities and conservatories across the United States but opted to remain in New Orleans to attend Loyola University. There, he focused on Jazz Studies on the contrabass and Classical Voice, actively participating in a wide array of ensembles and orchestras.

Wagner's jazz training afforded him the opportunity to study and perform alongside notable jazz musicians, including Ellis Marsalis and Billy Higgins. During his sophomore year at Loyola, he was recognized as the "Outstanding Music Major for the State of Louisiana" by the Louisiana Federation of Music Clubs. He also earned multiple singing awards, including the Loyola University's Opera Workshop Award (twice) and placements of 1st and 3rd in NATS competitions.

While at Loyola, Wagner made his professional debut with The New Orleans Opera Company, performing supporting baritone roles for three seasons alongside esteemed artists such as Renato Capecchi, June Anderson, Diana Soviero, Teresa Zylis-Gara, Carlo Bergonzi, Christina Deutekom, Johanna Meier, Victor Braun, and Siegfred Jerusalem. He later received full scholarships to both The Curtis Institute of Music and the Juilliard School in New York City, ultimately choosing to study at Curtis in Philadelphia. There, he continued his opera studies under the guidance of Boris Goldovsky and his protégés, making further important debuts with The Opera Company of Philadelphia, The Pennsylvania Opera Theater, and The Harrisburg Opera Company.

After obtaining his Master's Degree, Wagner's vocal range began to shift towards tenor. Following the advice of Anna Moffo and other prominent teachers, he undertook a retraining of his voice. During this period, he had the honor of singing for Pope John Paul II at the Vatican in Rome and was mentored by Maestro Carlo Bergonzi, who confirmed his transition to tenor. Returning to the U.S., he attended The Academy of Vocal Arts before relocating to New York City, where he studied with renowned tenors at the Metropolitan Opera and participated in various Off-Broadway musical and theater productions.

Wagner made his New York Oratorio debut with The New York Choral Arts Society and was also invited to perform for the Kennedy family. He later participated in an all-Verdi concert alongside Metropolitan Opera artists at The International Verdi Festival in Busseto, Italy, and made his debut in Tosca with The New Jersey State Opera before moving to Europe to live, study, and perform.

Currently residing in Vienna, Wagner has appeared with the Vienna State Opera, the Volksoper, Neuer Oper Wien, and other European venues. In November 2003, he debuted at the Opera Bastille in Paris in Die Meistersinger. He is frequently seen touring with the acclaimed Broadway musical highlights show "The Night of the Musicals" (Die Nacht der Musicals) across Germany, Switzerland, and Austria. Since moving to Vienna, he has consistently performed with the Seefestspiele in Mörbisch, and was selected by composer Johanna Doderer for the title role in her opera Strom. Wagner is featured on the recording of the new opera Hamlet released by Vienna Modern Masters/Naxos and has a solo CD titled "Love Beyond Death," which was released in November 2012. In August 2013, he performed the title role of Edgar Aubry in Marschner's opera Der Vampyr with the Donau Philharmonie.