Zünd studied law at the University of Bern from where he obtained a licentiate in 1982 and doctorate in 1986.
Professional career
After graduation he became a court clerk at the of Argovia for a year before he assumed the same duty at the Swiss Federal Court in Lausanne between 1987 until 1996. Besides he acted as the substitute judge for the high court in Argovia between 1987 and 2002 before he assumed as an ordinary Judge at the same court from 2002 to 2004. Concordantly he also acted as a part-time judge at the Federal Court of Switzerland from 1996 to 2004 before he was elected a Federal Judge in Dezember 2003 as the successor of Martin Schubarth.