| Alan Anthony Brace | Secretary | 3 Jan 1993 | 9 Jan 1995 | British | - |
| August Antonius Fischer | Director | 3 Jan 1993 | 15 Mar 1995 | Swiss | 87 years |
| Carla Stone | Secretary | 31 Oct 2001 | 2 Apr 2012 | British | - |
| Christopher Charles Stoddart Longcroft | Director | 26 Sept 2012 | 25 Jul 2022 | British | 55 years |
| John Collier | Director | 3 Jan 1993 | 15 Mar 1995 | British | 105 years |
| John Edward Widdows | Director | 15 Mar 1995 | 29 Aug 1997 | British | 81 years |
| Michael Charles Gill | Director | 13 Aug 2007 | 22 Jul 2024 | British | 63 years |
| Peter Walter Stehrenberger | Director | 3 Jan 1993 | 31 Oct 2001 | Swiss | 88 years |
| Peter Walter Stehrenberger | Secretary | 9 Jan 1995 | 31 Oct 2001 | Swiss | - |
| Stephen Frank Hutson | Director | 29 Aug 1997 | 13 Aug 2007 | British | 71 years |
| Stephen Wayne Daintith | Director | 13 Aug 2007 | 17 Jul 2008 | British | 62 years |
| Sunil Anthony Fernando | Director | 31 Oct 2001 | 13 Aug 2007 | British | 81 years |
| Susan Lee Panuccio | Director | 17 Jul 2008 | 26 Sept 2012 | Australian | 54 years |