Bernhard Haas studied organ, piano, harpsichord, sacred music, composition and music theory in Cologne, Freiburg and Vienna. He won several international prizes at organ competitions, such as the Bach-Wettbewerb in Wiesbaden 1983 and the Liszt-Wettbewerb in Budapest in 1988.
From 1989 to 1995 he taught organ and organ-improvisation at the music school in Saarbrücken. In 1994 he became an organ professor at the Staatliche Hochschule für Musik und Darstellende Kunst Stuttgart. In 2012/13 he moved to the Hochschule für Musik und Theater München to succeed Edgar Krapp.
He has been toured in Europe as well as to the US and Japan. His main interest is music of the 17th and 19th century, contemporary music, Johann Sebastian Bach and Wolfgang Amadeus Mozart. He has also released CDs of adaptations of works by Franz Liszt, Max Reger, Igor Stravinsky, Brian Ferneyhough, Morton Feldman and Iannis Xenakis. As a musicologist, he has written a book on ‘new tonality’ from Schubert to Webern and a collaboration with Veronica Diederen on the two-part inventions by J. S. Bach.