 |
 |
 |
| Michael Palumbo 2017-20 |
Kathryn Steely 2014-17 |
Nokuthula Ngwenyama 2011-14 |
 |
 |
 |
| Juliet White-Smith 2008-11 |
Helen Callus 2005-08 |
Ralph Fielding 2002-05 |
 |
 |
 |
| Peter Slowik 1998-2002 |
Thomas Tatton 1994-98 |
Alan de Veritch 1990-94 |
 |
 |
 |
| David Dalton 1986-90 |
Maurice Riley 1981-86 |
Myron Rosenblum 1971-81 |
