| Alan Thomas Hirzel | Director | 30 Jan 2014 | 6 Dec 2023 | American | 58 years |
| Anthony Francis Martin | Director | 16 Sept 2011 | 31 Oct 2016 | British | 71 years |
| Chienling Lee | Director | 27 Jan 2021 | 6 Dec 2023 | Taiwanese,chinese | 60 years |
| Christopher Matthew Bouda | Director | 6 Dec 2023 | 29 Jul 2025 | American | 49 years |
| David Douglas Cleevely | Director | 18 Apr 1998 | 2 Nov 2009 | British | 72 years |
| David James Warwick | Director | 1 Nov 2000 | 31 Dec 2016 | British | 60 years |
| Edward William Powell | Director | 15 Apr 2000 | 20 Nov 2007 | British | 77 years |
| Edward William Powell | Secretary | 13 Feb 2001 | 7 Jun 2004 | British | - |
| Frank Talbot Mcfaden | Director | 6 Dec 2023 | 29 Jul 2025 | American | 64 years |
| Gavin Hilary James Wood | Director | 12 Sept 2016 | 3 Feb 2020 | British | 56 years |
| Giles Francis Bertram Kerr | Director | 12 Dec 2018 | 6 Dec 2023 | British | 66 years |
| Jeffrey Michael Iliffe | Secretary | 2 Nov 2009 | 6 Jul 2015 | - | - |
| Jeffrey Michael Iliffe | Director | 20 Nov 2007 | 12 Sept 2016 | British | 63 years |
| John Richard Short | Director | 12 Feb 1998 | 18 Apr 1998 | British | 76 years |
| John Richard Short | Secretary | 12 Feb 1998 | 18 Apr 1998 | British | - |
| Jonathan Simon Milner | Director | 18 Apr 1998 | 2 Oct 2020 | British | 60 years |
| Jonathan Simon Milner | Secretary | 18 Apr 1998 | 12 Mar 1999 | British | - |
| Louise Alexandra Virginia Charlotte Patten | Director | 27 Mar 2014 | 18 May 2021 | British | 71 years |
| Lubov Greenwood | Director | 12 Sept 2022 | 6 Dec 2023 | American | 46 years |
| Luke Hughes Davies | Director | 18 Apr 1998 | 18 Nov 1998 | British | 64 years |
| Mara Glickman Aspinall | Director | 14 Sept 2015 | 6 Dec 2023 | American | 63 years |
| Marc Leigh Russell Perkins | Secretary | 29 Mar 2019 | 22 Feb 2024 | - | - |
| Mark Christopher Capone | Director | 27 Jan 2021 | 6 Dec 2023 | American | 63 years |
| Mark John Alexander Webster | Director | 31 Jul 2006 | 21 Oct 2011 | British | 63 years |
| Michael Alexander Nunes Ross | Director | 1 Nov 2011 | 31 Oct 2016 | British | 56 years |
| Michael Redmond | Director | 1 Mar 2009 | 3 Nov 2014 | British | 81 years |
| Michael Shaun Baldock | Director | 3 Feb 2020 | 6 Dec 2023 | American | 62 years |
| Michael Thomas Womack | Nominee Director | 12 Feb 1998 | 18 Apr 1998 | British | 78 years |
| Murray Edwin Hennessy | Director | 1 Nov 2011 | 14 Nov 2017 | Irish | 64 years |
| Peter Stephen Keen | Director | 27 Oct 2005 | 3 Nov 2014 | British | 68 years |
| Peter Vance Allen | Director | 18 Jun 2018 | 6 Dec 2023 | British | 69 years |
| Philip Bernard Whitehead | Director | 6 Dec 2023 | 29 Jul 2025 | British | 74 years |
| Sally Wellinghoff Crawford | Director | 12 Aug 2021 | 6 Dec 2023 | American | 72 years |
| Susan Elizabeth Dixon | Secretary | 1 Nov 1998 | 13 Feb 2001 | British | - |
| Susan Elizabeth Harris | Director | 12 Dec 2014 | 13 Nov 2019 | British | 64 years |
| Suzanne Elaine Smith | Secretary | 6 Jul 2015 | 29 Mar 2019 | - | - |
| Thomas Cochrane Mcguire | Secretary | 7 Jun 2004 | 2 Nov 2009 | British | - |
| Timothy George Dye | Director | 31 Jul 2006 | 21 Oct 2011 | British | 63 years |
| Tony Kouzarides | Director | 18 Apr 1998 | 22 Oct 2012 | British | 67 years |