| 2017 - 2020 | Karen Scolforo |
| 2015 - 2017 | Dave Wolk |
| 2001 - 2015 | Dave Wolk |
| 1994 - 2001 | Martha K. Farmer |
| 1993 - 1994 | Joseph T. Mark (Interim) |
| 1987 - 1993 | Lyle A. Gray |
| 1979 - 1987 | Thomas K. Meier |
| 1979 | Walter S. Reuling (Acting) |
| 1976 - 1979 | Donald W. Wilson |
| 1975 - 1976 | Dorothy M. Burns (Acting) |
| 1970 - 1975 | Harold Abel |
| 1969 - 1970 | H. Franklin Irwin (Acting) |
| 1962 - 1969 | Richard Dundas |
| 1957 - 1962 | Richard Dundas |
| 1956 - 1957 | Florence Black (Acting) |
| 1950 - 1956 | Alden Carr |
| 1947 - 1950 | John C. Huden |
| 1946 -1947 | John C. Huden |
| 1940 - 1946 | Ermo H. Scott |
| 1921 - 1940 | Caroline Woodruff |