- 1921-1932: Lewis Williams, Principal
- 1933-1943: Charles W. Sanford, Principal
- 1944-1956: Charles M. Allen, Principal
- 1957: Roger K. Brown, Acting Principal
- 1958-1964: David M. Jackson, Principal/Director
- 1965-1967: Dr. Wilfred L. Shoemaker, Principal
- 1965-1970: Dr. Max Beberman, Director
- 1968: Robert G. Carlier, Principal
- 1969-1973: Dr. Anthony F. Gregorc, Principal
- 1974: Russel Zwoyer, Principal
- 1975, 1976: Dr. Robert B. Davis, Principal, Director
- 1976: James Raths, Principal
- 1977-1986: Warren Royer, Principal
- 1977-1983: Dr. Allen C. Purves, Director
- 1984: Dr. Anthony Peressini, Acting Director
- 1985-1990: Russel Ames, Director
- 1991: Steve Epperson, Acting Director
- 1992-1993: Henry Mears, Principal
- 1994: Barbara Wysocki, Acting Principal
- 1995-1998, 1996-1998: Dr. Shelley Roberts, Principal, Director
- 1988-2003: John Hedeman: Principal/Director
- 2003-2007: Kathleen Moroney Patton: Principal/Director
- 2007-2009: Dr. Steve Epperson, Interim Principal/Director
- 2009-2019: Dr. Jefferey Walkington: Principal/Director
- 2019-Present: Dr. Elizabeth Majerus: Principal/Director