The Croatian mezzo-soprano studied at the Giuseppe Tartini Conservatory in Trieste, at the Royal Academy of Music in London and at the Staatliche Hochschule für Musik und Darstellende Kunst in Stuttgart with Dunja Vejzović. She continues to be coached by KS. Brigitte Fassbaender. After a year in the opera studio of the Stuttgart State Opera, Diana Haller became the youngest member of the ensemble in the 2010/11 season and has since sung roles such as Cenerentola, Rosina (Il barbiere di Siviglia), Cherubino (Le nozze di Figaro), Ruggiero (Alcina), Dorabella (Così fan tutte), Ariodante, Hänsel etc. Guest engagements have taken her as Ruggiero to the Semperoper Dresden, Opéra de Strasbourg, Cologne Opera; as Cenerentola she was a cover at the Metropolitan Opera New York, and she performed this role at the Salzburg Festival and the Gärtnerplatztheater in Munich; she made her Debut as Enrichetta di Francia (I Puritani) at the Zurich Opera House, and was Komponist (Ariadne auf Naxos) at the Philharmonie Köln and at the Frankfurt Oper. Before having her Debut at La Scala in Milan in 2018 in the new production of Francesca da Rimini as Altichiara, and as Adalgisa (Norma) at the the State Opera Hamburg and Rijeka, she had her Salzburg Festival debut as Ines in Verdi’s “Il Trovatore” alongside Anna Netrebko and Placido Domingo. At the Maggio Fiorentino she sang Mahler’s 8th Symphony under Fabio Luisi, as well as the same symphony at the Bregenz Festival under Kirill Petrenko. The artist celebrated particular successes with the role of Octavian in “Der Rosenkavalier” and in 2022 her debut at the Theater an der Wien as Pippo (La gazza ladra). The 2023/24 season includes an European tour with a Mendelssohn programme conducted by Jordi Savall, among others, Eboli (Don Carlos), and her role debut as Fricka in “Das Rheingold“. Her discography includes a CD with Bayerische Rundfunk & Concerto Köln), Echoes of the grand Canal (Audax Records), a Naxos DVD as Enrichetta di Francia (Puritani) and a DVD as Tancredi recorded at the Bad Wildbad Festival. In 2012 she was won the first prize at the 8th International Competition for Lied Art of the Hugo Wolf Academy and in 2013 Diana Haller was voted Young Singer of the Year in the critics’ poll of Opernwelt magazine. This was followed by the award Milka Trnina for outstanding artistic achievement, the main prize at the 5th Manhattan International Competition, and the Inge Borkh Prize. In 2021 she was given the highest award and titel that a singer can receive in Germany – Kammersängerin. She is an honorary member of the Croatian National Theatre Rijeka ensemble and teaches as a guest professor at the Music University of Stuttgart. In 2013 she started to work as a director and had her debut at the Stadttheater Weißenhorn with Telemanns Pimpinone. Followed by the great success of Pimpinone, she worked further in Weißenhorn and staged in 2015 Bellinis Norma and in 2018 and Bellinis I Capuleti e i Montecchi, which was revived with great demand in 2023.