| Alain Scherrer | Director | 5 Nov 2015 | 30 Jun 2016 | Swiss | 50 years |
| Alain Scherrer | Director | 1 Jul 2016 | 23 Dec 2016 | Swiss | 50 years |
| Andreas Kranz | Director | 1 Mar 2009 | 28 Feb 2010 | Swiss | 59 years |
| Andreas Kranz | Director | 1 Oct 2010 | 30 Jun 2016 | Swiss | 59 years |
| Andrew Nash | Secretary | 21 Sept 1998 | 26 May 2000 | British | - |
| Barry Paul Hope | Director | 1 Jan 2014 | 13 Aug 2014 | British | 58 years |
| Beat Fellmann | Director | 7 Nov 2006 | 15 Aug 2008 | Swiss | 62 years |
| Benoit Henri Koch | Director | 23 Mar 2005 | 9 Nov 2006 | French | 73 years |
| Christoph Haller | Director | 15 Aug 2008 | 1 Oct 2010 | Swiss | 64 years |
| Christopher Stuart Bailey | Director | 14 May 1997 | 31 Dec 2004 | British | 80 years |
| Christopher Stuart Bailey | Secretary | 13 Jul 1998 | 1 Dec 2001 | British | - |
| Christopher Stuart Bailey | Secretary | 26 May 2000 | 1 Dec 2001 | British | - |
| David Charles Jones | Director | 3 Feb 2004 | 23 Mar 2005 | British | 83 years |
| David Malcolm Kaye | Secretary | 29 Jun 1991 | 30 Sept 1992 | British | - |
| David Michael Saunders | Director | N/A | 11 Sept 1991 | British | 91 years |
| David Robert Forder | Director | 1 Apr 2014 | 13 Aug 2014 | British | 61 years |
| David Robert Forder | Director | 13 Aug 2014 | 21 Nov 2019 | British | 61 years |
| David Tidmarsh | Director | 14 May 1997 | 30 Jun 2003 | British | 81 years |
| Digby Lord Jones Of Birmingham | Director | 1 Aug 2006 | 22 Sept 2006 | British | 71 years |
| Donald Reed | Director | 1 Mar 2002 | 9 Nov 2006 | American | 82 years |
| Douglas Martin Yates | Director | 14 May 1997 | 23 Mar 2005 | British | 83 years |
| Frank John Davies | Director | 24 Feb 1994 | 25 Apr 2002 | British | 95 years |
| George Edward Plant | Director | 28 Apr 1994 | 9 Jul 1997 | British | 87 years |
| George William Bolsover | Director | 11 Dec 2000 | 9 Nov 2006 | British | 76 years |
| Gerald Edgar Grimstone | Director | 14 Mar 2000 | 30 Sept 2004 | British | 77 years |
| James Keith Retallack | Director | 1 Dec 2001 | 30 Jun 2011 | British | 69 years |
| James Murray | Director | 29 Jun 1991 | 26 Jul 1993 | British | 85 years |
| James West Atherton-ham | Director | 1 Jul 2011 | 31 Mar 2014 | British | 56 years |
| John Barry Ford | Director | 29 Jun 1991 | 22 May 1992 | British | 80 years |
| John Ferguson Bowater | Director | 1 Jul 2004 | 9 Nov 2006 | British | 77 years |
| John Michael Leal Uren | Director | 29 Jun 1991 | 1 Sept 1993 | British | 103 years |
| Justine Anne Dwyer | Director | 21 Nov 2019 | 1 Jun 2023 | Australian | 55 years |
| Katrin Gertrude Boldt | Director | 1 Mar 2016 | 31 May 2018 | German | 63 years |
| Keith Harris | Director | 29 Jun 1991 | 2 Dec 1991 | British | 79 years |
| Malcolm John Crump | Director | 8 Mar 1999 | 18 Aug 2006 | British | 85 years |
| Marcus De La Poer Beresford | Director | 14 May 1997 | 4 Jul 2000 | British | 84 years |
| Mark Anatol Schmidt | Director | 1 Mar 2010 | 27 Jan 2014 | Swiss | 56 years |
| Markus Akermann | Director | 23 Mar 2005 | 9 Nov 2006 | Swiss | 79 years |
| Markus Leo Unternahrer | Director | 27 Jan 2014 | 5 Nov 2015 | Swiss | 58 years |
| Markus Leo Unternahrer | Director | 5 Nov 2015 | 1 Mar 2016 | Swiss | 58 years |
| Mary Ford | Secretary | 1 Dec 2001 | 30 Mar 2012 | British | - |
| Maurice Eric Warren | Director | 14 May 1997 | 27 Apr 2000 | British | 93 years |
| Michael Eugene Hayes | Director | 14 May 1997 | 31 Dec 2001 | American | 90 years |
| Norman Fowler | Director | 29 Jun 1991 | 9 Nov 2006 | British | 88 years |
| Oliver Trevor Marwood Templar-coates | Director | 13 Aug 2014 | 12 Jan 2018 | British | 47 years |
| Paul Forrest Bartley | Director | 9 Jun 1993 | 10 Jan 1997 | American | 81 years |
| Peter James Wright | Director | 12 Dec 2006 | 30 Jun 2010 | British | 69 years |
| Peter Parker | Director | 29 Jun 1991 | 12 May 1994 | British | 102 years |
| Peter William Gregory Tom | Director | 29 Jun 1991 | 9 Nov 2006 | British | 86 years |
| Richard Hawke Collins | Secretary | 23 May 1997 | 13 Jul 1998 | British | - |
| Roy Henry Richard Kettle | Director | 29 Jun 1991 | 30 Sept 1993 | British | 102 years |
| Shelley A Longmuir | Director | 1 Oct 2004 | 23 Mar 2005 | United States | 70 years |
| Stuart Milton Lamb | Director | 29 Jun 1991 | 28 Oct 1994 | American | 84 years |
| Terence Michael Gateley | Director | 1 Aug 2006 | 22 Sept 2006 | British | 73 years |
| Theophil Hermann Schlatter | Director | 7 Nov 2006 | 1 Apr 2011 | Swiss | 75 years |
| Thomas Aebischer | Director | 1 Apr 2011 | 5 Nov 2015 | Swiss | 65 years |
| Thomas Ashley Clough | Director | 20 Mar 2005 | 9 Nov 2006 | British | 79 years |
| Thomas Gerard Neiland | Director | 29 Jun 1991 | 14 May 1997 | British | 90 years |
| Timothy Nicholas Grimes | Secretary | 1 Oct 1992 | 23 May 1997 | British | - |
| William Brendan Mcgrath | Director | 1 Sept 1992 | 10 Oct 1997 | British | 68 years |