- 1968

Josef Rusch (1938)

1968 - 1977

Jakob Lutz (1939)

1984 - 1992

Anna Zeller (1963)

1992 - 1998

Alfred Dörig (1949)

1998 - 2003

Reto Koller (1975)

2003 - 2010

Nicole Stock (1975)

2010 - 2014

Lydia Haas (1965)

2014 - 2019

Doris Aeschbacher (1973)

2019 -

Sandra Jans (1986)