| Director | Years |
| J.S. Plaskett | 1917-1935 |
| W.E. Harper | 1936-1040 |
| J.A. Pearce | 1940-1951 |
| R.M. Petrie | 1951-1966 |
| K.O. Wright | 1966-1976 |
| E.H. Richardson | 1976-1977 |
| S. van den Bergh | 1977-1986 |
| J.E. Hesser | 1986-2014 |
| D.R. Crabtree | 2014-2018 |
| J. Di Francesco | 2018-present |