| Ann Bolen | Director | 1 Apr 1999 | 8 Jan 2002 | British | 64 years |
| Bennett Charles Birgbauer | Director | 1 Sept 2000 | 1 Dec 2005 | United States | 63 years |
| Cheryl Ann Pilat | Director | 1 Aug 2016 | 31 Jan 2021 | American | 66 years |
| Clive Charles Page | Secretary | 27 Oct 1995 | 1 Jun 2015 | British | - |
| Daniel Lawrence Greenbaum | Director | 27 Oct 1995 | 16 Jun 2003 | British | 81 years |
| David Brandi | Director | 1 Jan 1997 | 13 Jul 1999 | American | 81 years |
| David Desandre | Director | 30 Oct 2009 | 23 Sept 2011 | Us Citizen | 64 years |
| David Leonard Basirico | Director | 24 Apr 2008 | 1 Jun 2011 | American | 58 years |
| David Moore | Director | 5 Feb 2002 | 6 Apr 2005 | American | 55 years |
| David Nicholas Robinson | Secretary | 1 Jun 2015 | 1 Mar 2021 | - | - |
| David Scott Dickenson | Director | 1 Jun 2011 | 1 Oct 2012 | Us Citizen | 68 years |
| Donald Elbaum | Director | 7 Jan 2002 | 24 Jun 2005 | American | 66 years |
| Eric Christopher Boehm | Director | 1 Sept 2011 | 1 Oct 2014 | Us Citizen | 55 years |
| Erin Michelle Rohde | Director | 15 Oct 2003 | 11 Apr 2006 | American | 53 years |
| Geoffrey Mellor | Director | 1 Jan 1997 | 3 Dec 1999 | British | 61 years |
| Graham Paul Hughes | Secretary | 2 Apr 2001 | 17 Jun 2009 | Other | - |
| James Michael Williams | Director | 1 Jan 1997 | 12 Mar 1999 | Amerian | 78 years |
| Jason Carl Behnke | Director | 23 Sept 2005 | 30 Oct 2009 | United States Citize | 53 years |
| Jeffrey Robert Czerniak | Director | 1 Jun 2014 | 1 Jun 2017 | American | 58 years |
| Jessica Cheryl Vila-goulding | Director | 1 Feb 2021 | 1 Jan 2023 | American | 41 years |
| Kathleen Moira Gallagher | Director | 16 May 2007 | 1 Oct 2016 | American | 67 years |
| Kathleen Moira Gallagher | Director | 13 Jul 1999 | 1 Jul 2004 | American | 67 years |
| Kenneth Alan Kincaid | Director | 1 Sept 2014 | 6 Jun 2017 | Us Citizen | 59 years |
| Kermala Michele Dudley | Director | 16 May 2007 | 1 Jul 2007 | United States Citizen | 61 years |
| Kevin Spann Fowler | Director | 1 Jun 2011 | 1 Jun 2014 | Us Citizen | 51 years |
| Kevin Winton Reynolds | Director | 27 Oct 1995 | 1 Aug 1996 | British | 70 years |
| Kimberley Dawn Plummer | Director | 1 Jul 2004 | 18 Jan 2007 | Us | 55 years |
| Laura Hirschhorn | Director | 7 Jan 2002 | 15 Oct 2003 | American | 59 years |
| Lyle Alexander Watters | Director | 12 Mar 1999 | 1 Sept 2000 | British | 60 years |
| Marilyn Denise Horn | Director | 6 Apr 2005 | 16 May 2007 | United States Citize | 65 years |
| Maurice Edmund Maretens | Director | 27 Oct 1995 | 31 Dec 1996 | American | 83 years |
| Michael Nabil Bishay | Director | 23 Mar 2017 | 1 Oct 2020 | American | 46 years |
| Patricia Little | Director | 7 Jan 2002 | 5 Aug 2002 | American | 65 years |
| Paul Clink | Director | 1 Jun 2011 | 1 Jun 2014 | Us Citizen | 63 years |
| Peter Philip Croughan | Director | 27 Oct 1995 | 12 Mar 1999 | British | 79 years |
| Raymond Francis Yerkes | Director | 1 Sept 2014 | 23 Mar 2017 | Us Citizen | 61 years |
| Richard Colin Morgan | Director | 1 Aug 1996 | 31 Dec 1996 | British | 68 years |
| Shawn Michael Ryan | Director | 1 Sept 2014 | 30 Jun 2016 | Us Citizen | 55 years |
| Sherman Eugene Garner | Director | 1 Jun 2017 | 31 Mar 2022 | American | 67 years |
| Stephen John Ward | Director | 1 Sept 2000 | 31 Dec 2003 | British | 71 years |