| Daniel John O'sullivan | Director | 15 Oct 1992 | 1 Apr 2003 | British | 88 years |
| Daniel John O'sullivan | Secretary | 15 Oct 1992 | 1 Apr 2003 | British | - |
| Filip Boyen | Secretary | 30 Jul 2013 | 31 Mar 2015 | - | - |
| Filip Joseph Marcel Boyen | Director | 30 Jul 2013 | 31 Mar 2015 | Belgian | 68 years |
| Ingrid Eras-magdalena | Director | 31 Mar 2015 | 31 Mar 2022 | Dutch | 61 years |
| James Blair Sherwood | Director | 15 Oct 1992 | 31 Dec 1995 | American | 93 years |
| James Blair Sherwood | Director | 22 Apr 1999 | 5 Mar 2007 | American | 93 years |
| James Gavin Struthers | Director | 31 Oct 2000 | 7 Oct 2005 | British | 63 years |
| James Gavin Struthers | Secretary | 1 Apr 2003 | 7 Oct 2005 | British | - |
| Jean-paul Foerster | Director | 15 Oct 1992 | 31 Oct 2000 | German | 77 years |
| John Marcy Scott | Director | 31 Mar 2015 | 20 Sept 2015 | Usa | 61 years |
| Jonathan David Salter | Director | 31 Jul 2007 | 28 Aug 2009 | British | 59 years |
| Keith Mervyn Reed | Director | 31 Mar 2015 | 31 Mar 2015 | British | 67 years |
| Martin O'grady | Director | 8 Jul 2011 | 31 Dec 2019 | British | 63 years |
| Michael John Louis Stracey | Director | 15 Oct 1992 | 30 Jun 1997 | British | 94 years |
| Nicholas Roger Varian | Director | 10 Apr 2006 | 26 Aug 2011 | British | 72 years |
| Paul Martin White | Director | 7 Oct 2005 | 8 Jul 2011 | British | 62 years |
| Paul Martin White | Secretary | 7 Oct 2005 | 8 Jul 2011 | British | - |
| Peter Parrott | Director | 15 Oct 1992 | 30 Apr 2001 | English | 92 years |
| Philip Alan Calvert | Secretary | 8 Jul 2011 | 30 Jul 2013 | - | - |
| Philip Alan Calvert | Director | 28 Aug 2009 | 30 Jul 2013 | British | 74 years |
| Simon Michael Cross Sherwood | Director | 1 Apr 2003 | 31 Jul 2007 | British | 66 years |
| Veronique Robin Amour | Director | 28 Jul 2020 | 5 Jun 2024 | French | 55 years |