Born in Bern, he first studied piano and composition in his home town. In1984 he began to study conducting at the Folkwang-University in Essen with Prof. Peters. He began his career as répétiteur and second capellmeister in Mainz, became first capellmeister in Augsburg for three years, and worked in the same position for the last six years at the Mannheim National Theatre. Stefan Blunier was general music director of the Darmstadt State Theatre from 2001 till 2008. Since January 2009 he is general music director of the city of Bonn.
In the 1990s he was award winner of the conducting contests in Besancon and Copenhagen.
Stefan Blunier made guest performances with the radio symphony orchestras in Frankfurt, Hamburg and Stuttgart, the Hanover Radio Philharmonic, the MDR-Symphony Orchestra Leipzig, the radio orchestras in Cologne and Munich, the Duisburg Symphony, the Orchestra of the Beethovenhalle Bonn as well as the State Music Ensemble in Weimar. Opera guest performances took him to the Bayerische Staatsoper in Munich, the Stuttgart State Theatre, to the Deutsche Oper Berlin as well as to the Leipzig Opera. Abroad he made guest performances for the opera houses of Montpellier and Oslo. In the season 2004/05, Stefan Blunier conducted again for the Leipzig Opera the performances of Mozart's »The Magic Flute« and Wagner's »Tannhäuser«. He made his debut at the Hamburg Opera with Bizet's »Carmen«. Besides he leads the Leipzig Gewandhaus Orchestra, the orchestra of the Komische Oper Berlin as well as the German Chamber Philharmonic.
Stefan Blunier's programmatic preference for the modern and less known compositions of the late romantic period is reflected in the Darmstadt programmes: The audience heard works of Hans Pfitzner, Max Reger, Alexander von Zemlinsky, Feruccio Busoni and Arnold Schönberg. He presented rarities, such as Franz Schreker's opera »Das Spielwerk«, the German debut performance of Kaija Saariaho's »L’Amour de loin« as well as Friedrich Cerha's »Der Rattenfänger«.
For Sony, Stefan Blunier has recorded with the Cologne Radio Orchestra all violin concerts of Édouard Lalo, Emil Nikolaus von Reznicek and Max von Schillings.
For the Komische Oper Berlin he conducts in the season 2009/10 the performances of »The Love of three oranges« and the 5th Symphony Concert.