After beginning his musical training in Alsace, Benoît Haller studied choral and orchestral conducting with Hans Michael Beuerle at the Musikhochschule in Freiburg im Breisgau, where he was awarded his higher diploma with the jury's congratulations in 1996. Masterclasses with personalities like Eric Ericson, Pierre Cao and Frieder Bernius completed his training. In parallel with this he studied singing in Strasbourg with Hélène Roth, and from 1997 onwards with Beata Heuer- Christen, Gerd Heinz and Hans Peter Müller at the Musikhochschule of Freiburg, where he performed the role of Ferrando in Così fan tutte (2000) and the title role in Britten's Albert Herring (2002).
During these years, tours with ensembles like Collegium Vocale Gent (Philippe Herreweghe) and the Kammerchor Stuttgart (Frieder Bernius) took him all over Europe, Asia, and the USA. As a singer, he makes regular appearances in opera, particularly Baroque (Handel's Almira, Purcell's King Arthur), and is a noted interpreter of the Passions and cantatas of Bach as well as the major choral works of Mozart, Haydn, Mendelssohn, and Berlioz. He has recorded music by Schütz (Akadêmia/ Françoise Lasserre), Rosenmüller (Cantus Cölln/Konrad Junghänel), Telemann (Balthasar Neumann Ensemble/Thomas Hengelbrock), Mozart (Peter Neumann), and Gossec (Jean-Claude Malgoire).
In 2001, Benoît Haller founded La Chapelle Rhénane to bring together French and German musician friends. He has directed the ensemble ever since. He also pursues a career as guest conductor: for example, in May 2009 he conducted the Orchestre Régional de Bayonne-Côte Basque in C. P. E. Bach's Die letzten Leiden des Erlösers.