His publications include books and music editions, such as organ works by Johann Sebastian Bach.

Born in Winterthur, Zehnder studied at the conservatory of his hometown, at the University of Zurich, at the Musikakademie Wien with Anton Heiller, and in Amsterdam with Gustav Leonhardt.

[1] His publications focus on topics such as the early works by Johann Sebastian Bach, which won him an honorary doctorate from the Technische Universität Dortmund in 2002.

He has lectured at the Sommerakademie für alte Musik in Innsbruck and has cofounded organ weeks in Arlesheim and Muri.

[1] Zehnder's recordings include Bachs Orgelbüchlein and his Great Eighteen Chorale Preludes (Die achtzehn Leipziger Choräle).