| Alan Alexander Seywright | Director | 21 Mar 2016 | 12 Dec 2016 | British | 67 years |
| Allyn Byram Taylor | Director | 26 Sept 2007 | 6 Jun 2011 | United States | 78 years |
| Andrew Hewitt Medlock | Director | 22 Mar 1993 | 17 Jan 1994 | British | 82 years |
| Andrew Hewitt Medlock | Secretary | 22 Mar 1993 | 17 Jan 1994 | British | - |
| Anne Elizabeth Prichard | Director | 25 Aug 2016 | 27 Mar 2018 | English | 67 years |
| Anne Glover Macrae | Secretary | 2 Dec 1999 | 1 Dec 2009 | British | - |
| Claudia Jaramillo | Director | 14 Aug 2023 | 16 Apr 2024 | Colombian | 54 years |
| Clive Thomas White | Director | 9 Mar 2020 | 11 Aug 2021 | British | 64 years |
| David Baird | Director | 20 Dec 2007 | 22 Jan 2016 | British | 71 years |
| David Charles Shepherd | Director | 22 Mar 1993 | 19 Feb 1996 | British | 83 years |
| David Ellis | Director | 21 Mar 2016 | 1 Jul 2024 | British | 54 years |
| David Joseph Coultas | Director | 13 Apr 2011 | 9 Dec 2020 | British | 64 years |
| Erwin Geene | Director | 18 Nov 2016 | 26 Apr 2019 | Dutch | 56 years |
| Frank Edward Hart | Director | 22 Mar 1993 | 31 May 1993 | British | 89 years |
| Frederick John Barry | Director | 1 Jun 1997 | 19 Mar 1999 | Irish | 75 years |
| Frederick John Barry | Director | 24 Jun 1999 | 16 Aug 2002 | Irish | 75 years |
| Georgina Charmaine Linton | Secretary | 17 Jan 1994 | 2 Dec 1999 | British | - |
| Gerald Lee Stevenson | Director | 22 Mar 1993 | 3 Jun 1994 | Usa | 89 years |
| Graham James Dibble | Director | 16 Jun 1994 | 7 Mar 2002 | British | 76 years |
| Graham Roger Jones | Director | 7 Mar 2002 | 1 Jan 2012 | British | 78 years |
| Guy Douglas | Director | 30 Apr 2019 | 11 Aug 2021 | British | 45 years |
| Hugh Donald Morrison | Director | 9 Nov 2017 | 1 Sept 2023 | British | 56 years |
| James Joseph Healy | Director | 22 Mar 1993 | 30 Jun 1996 | Irish | 84 years |
| John Conor Doyle | Director | 23 Oct 2013 | 7 Oct 2016 | Irish | 67 years |
| John David Knott | Director | 1 Aug 2003 | 24 Jan 2006 | British | 86 years |
| John Mclachlan | Director | 29 Dec 1998 | 11 Oct 2004 | British | 80 years |
| John Warren Prosser | Director | 9 Apr 1998 | 29 Nov 2004 | American | 81 years |
| John Warren Prosser | Director | 24 Jan 2006 | 8 Jan 2015 | American | 81 years |
| Jonathan R. Shattock | Director | 18 Nov 2016 | 30 Nov 2020 | British | 62 years |
| Katherine Helen Kenny | Director | 9 Dec 2020 | 29 Jul 2025 | British | 46 years |
| Kevin Christopher Berryman | Director | 15 Jan 2015 | 14 Aug 2023 | American | 67 years |
| Leon Anthony Power | Director | 20 Dec 2011 | 5 Dec 2016 | Irish | 68 years |
| Lionel James Deering | Director | 22 Mar 1993 | 3 Jul 1999 | British | 87 years |
| Mark Cubitt | Director | 24 Jan 2006 | 12 Jan 2007 | British | 63 years |
| Martin Edward Hinton | Director | 11 Aug 2021 | 1 Jul 2024 | British | 60 years |
| Michael John Higgins | Director | 12 Jan 2007 | 13 Apr 2011 | United States | 82 years |
| Michael Norris | Secretary | 18 Jan 2010 | 1 Jan 2020 | - | - |
| Michael Udovic | Secretary | 13 Apr 2011 | 1 Sept 2015 | - | - |
| Michael William Fleetwood | Director | 12 Jan 2007 | 20 Dec 2011 | British | 69 years |
| Nazim Gulamhusein Thawerbhoy | Director | 22 Mar 1993 | 3 Jul 1999 | Usa | 79 years |
| Noel George Watson | Director | 22 Mar 1993 | 3 Jul 1999 | Usa | 90 years |
| Paul Seaton | Director | 21 Mar 2016 | 26 Apr 2019 | British | 62 years |
| Peter Robert Lutwyche | Director | 18 Nov 2016 | 30 Nov 2020 | British | 64 years |
| Philip John Stassi | Director | 11 Oct 2004 | 26 Sept 2007 | American | 71 years |
| Philip John Stassi | Director | 18 Sept 2013 | 30 Jun 2016 | American | 71 years |
| Rhona Mary Holman | Secretary | 10 Feb 2023 | 21 Aug 2023 | - | - |
| Richard James Slater | Director | 6 Jun 1994 | 31 Dec 2002 | American | 80 years |
| Robert Anthony Michael Irvin | Director | 7 Jun 2011 | 2 Mar 2016 | British | 68 years |
| Robert Claude Andre Matha | Director | 31 Jan 2003 | 1 Aug 2003 | French | 78 years |
| Robert Kilday Smith | Director | 22 Mar 1993 | 3 Jul 1999 | British | 76 years |
| Robert Kilday Smith | Director | 4 Sept 2000 | 31 Jan 2003 | British | 76 years |
| Robert Shepherd Duff | Director | 25 Mar 2009 | 7 Nov 2017 | British | 67 years |
| Robert Venkat Pragada | Director | 22 Jun 2016 | 6 Feb 2025 | American | 58 years |
| Tejender Singh Chaudhary | Secretary | 1 Jan 2020 | 10 Feb 2023 | - | - |
| Thomas Michael Tate | Director | 24 Sept 1996 | 3 Jul 1999 | British | 79 years |
| Thomas Roy Hammond | Director | 18 Jan 2010 | 18 Sept 2013 | Usa | 75 years |
| Walter Charles Barber | Director | 28 Oct 2003 | 12 Jan 2007 | American | 85 years |
| William Clyde Markley | Secretary | 9 Apr 1998 | 13 Apr 2011 | American | - |
| William Gilchrist Mitchell | Director | 29 Nov 2004 | 12 Jan 2007 | British | 82 years |
| William James Willism | Director | 22 Mar 1993 | 15 Jun 1994 | Usa | 87 years |
| William John Cameron Broadfoot | Director | 12 Jan 2007 | 25 Oct 2007 | British | 72 years |
| William Robert Kerler | Director | 22 Mar 1993 | 29 Dec 1998 | Usa | 97 years |