| Angela Hoffman | Director | 17 Feb 2004 | 13 Jun 2012 | American | 61 years |
| Betty June Doyle | Nominee Director | 13 Jan 1997 | 12 Mar 1997 | British | 90 years |
| Carol Anne Sinker | Director | 2 Dec 2005 | 1 Jan 2011 | British | 60 years |
| Christine Anne Daly | Secretary | 21 Dec 2007 | 23 Jul 2014 | British | - |
| Christopher Gordon Stanley Robey | Secretary | 1 May 1998 | 12 Jan 2006 | British | - |
| Christopher James Smith | Director | 1 Dec 2000 | 2 Dec 2005 | British | 71 years |
| Clifford A Johnson Iii | Director | 12 Jan 2006 | 21 Dec 2007 | American | 81 years |
| Clifford A Johnson Iii | Secretary | 12 Jan 2006 | 21 Dec 2007 | American | - |
| Daniel John Dwyer | Nominee Director | 13 Jan 1997 | 12 Mar 1997 | British | 85 years |
| Daniel John Dwyer | Nominee Secretary | 13 Jan 1997 | 12 Mar 1997 | British | - |
| Emma Kathryn Wrighton | Director | 2 Dec 2005 | 8 Mar 2006 | British | 53 years |
| Emma Kathryn Wrighton | Director | 21 Dec 2007 | 1 Jan 2012 | British | 53 years |
| George Christian Hedemann | Secretary | 1 May 1998 | 2 Jun 2008 | American | - |
| Grant Francis Smith | Director | 21 Dec 2007 | 1 Jan 2011 | British | 46 years |
| Ian Michael Robinson | Director | 1 Jan 2012 | 5 Apr 2022 | British | 61 years |
| Jenny Meegan | Director | 1 Apr 1997 | 4 Jun 2009 | American | 59 years |
| Jerry Myers | Director | 13 Jun 2012 | 21 Aug 2015 | British | 73 years |
| John Frederick Lunson | Director | 17 Sept 1998 | 1 Oct 2004 | British | 72 years |
| John Hardt | Director | 1 Jan 2011 | 7 Feb 2019 | American | 71 years |
| John James Farr | Director | 1 Apr 1997 | 13 Feb 2004 | American | 78 years |
| John Leon Aldridge | Director | 3 Dec 2004 | 4 Jun 2009 | British | 80 years |
| Michael Charles Tresise | Director | 1 Apr 1997 | 8 Oct 2000 | British | 65 years |
| Michael Christopher Williams | Director | 17 Apr 2018 | 21 Mar 2019 | American | 43 years |
| Michael Ernest Hannah | Director | 12 Mar 1997 | 18 Jul 2006 | British | 86 years |
| Michael Fines Allin | Director | 1 Apr 1997 | 5 Apr 2022 | British | 85 years |
| Peter Martin | Director | 30 Sept 2005 | 5 Apr 2022 | British | 71 years |
| Philip Anthony Weston | Director | 1 Jan 2011 | 21 Mar 2019 | British | 76 years |
| Philip Gordon Wiltshire | Director | 12 Dec 2005 | 1 Jan 2011 | British | 61 years |
| Robert Joerger | Director | 21 Aug 2015 | 27 Oct 2017 | Usa Citizen | 63 years |
| Steven Dee Winchester | Secretary | 12 Mar 1997 | 1 May 1998 | Usa | - |
| Timothy Triplett | Secretary | 2 Jun 2008 | 17 Jan 2014 | British | - |
| William Thomson | Director | 18 Dec 2000 | 31 Aug 2005 | British | 75 years |