Michel Willi studied with Aida Piraccini and Primoz Novsak and has attended numerous masterclasses with Igor Ozim and Abrham Shtern.
From 2000 until 2010 he was a member of the Nizol Quartett. He has also performed with Orchestra Winterthur, Orchestra Opera Zürich and Bayern Chamber Philharmonic.
In 1998 he joined the viola section at the Tonhalle Orchestra Zürich. He is currently also a member of the Schweizer Oktett ( Swiss Octet).