Katharina Müllner studied conducting, music education and philosophy/psychology in her hometown Vienna.
After her studies she was engaged as répetiteur and conductor at the Landestheater Linz, where she led Entführung aus dem Serail and Il matrimonio segreto as well as operettas and concerts for a young audience. Further performances included Die Zauberflöte at Theater Chemnitz and Roméo et Juliette at Theater Aachen.
In 2021/22 she gave her debuts at Theater St. Gallen with a new production of Die Zauberflöte, and at the Volksoper Wien (Der Teufel auf Erden) where she also jumped in at short notice for Brittens Death in Venice. She has conducted at the Deutsche Oper am Rhein, Kammeroper Wien, and led concerts with the Robert Schumann Philharmonie Chemnitz and Sinfonieorchester Wuppertal and conducted Carmen at the Deutsches Nationaltheater Weimar.
In 2022/23 she returned to Deutsche Oper am Rhein for a new production of Krabat and to Theater St. Gallen for the revival of Die Zauberflöte. The Aalto Theater Essen engaged her for Carmen and at Komische Oper Berlin she jumped in shortly before the premiere of Così fan tutte (director: Kirill Serebrennikov).
Additionally, she has been a guest conductor with Sinfonieorchester Wuppertal, Philharmonisches Orchester Coburg, Brandenburger Symphoniker and the SWR Symphonieorchester Stuttgart.
In 2023/24 she will lead the world premiere of a new work by Gordon Kampe at the Semperoper Dresden and returns to the Deutsche Oper am Rhein for the premiere of a new ballett by Dominique Dumais (A kiss to the world) and the revival of Krabat.
Further plans include a CD recording with Tim Posner and the Berner Symphonieorchester and concerts with Staatsphilharmonie Nürnberg, Kärntner Sinfonieorchester and Düsseldorfer Symphoniker.