| COUPLAND, Rebecca Arija, Ms. ACTIVE | Secretary | 05 Feb 2024 | | | | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| CHRISTIE, Heather ACTIVE | Director | 29 Apr 2016 | | England | March 1987 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| DEANE, Patrick, Dr ACTIVE | Director | 01 Mar 2020 | | Canada | December 1956 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| GIRVIN, Scott ACTIVE | Director | 30 Jun 2023 | | England | December 1977 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| KNOWLES, James Hastings Lewis ACTIVE | Director | 13 Mar 2015 | | England | May 1963 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| MCINNES, Alan ACTIVE | Director | 14 Mar 2014 | | United Kingdom | December 1947 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| PURVIS, Joshua Casey Dennis ACTIVE | Director | 14 Mar 2014 | | England | September 1972 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| BATESON, Anne Rosalind RESIGNED | Nominee Secretary | 25 Feb 1994 | 27 Jun 1994 | | | High Trees, Great Holland, Frinton On Sea, Essex, CO13 0HZ |
| BOWERS, Peter RESIGNED | Secretary | 31 Aug 2013 | 23 Feb 2018 | | | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| LEE, Valerie Hope RESIGNED | Secretary | 17 May 2019 | 14 Jun 2023 | | | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| MONTGOMERY, Alexander RESIGNED | Secretary | 27 Jun 1994 | 31 Aug 2013 | | | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| PURTILL, Victoria RESIGNED | Secretary | 21 Jul 2023 | 05 Feb 2024 | | | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| STEWART, Lori Ann RESIGNED | Secretary | 24 Feb 2018 | 17 May 2019 | | | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| BACON, Benoit-Antoine RESIGNED | Director | 29 Apr 2016 | 22 May 2018 | Canada | August 1972 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| BALDWIN, Darryl George RESIGNED | Director | 10 Jan 1996 | 16 Mar 2013 | Italy | April 1949 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| BOWERS, Peter RESIGNED | Director | 31 Aug 2013 | 23 Feb 2018 | England | December 1956 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| BROOK, Richard Kiel RESIGNED | Director | 27 Jun 1994 | 19 Dec 1995 | | August 1959 | 28 Vicarage Road, East Sheen, London, SW14 8RU |
| DEANE, Patrick, Dr RESIGNED | Director | 01 Jul 2005 | 30 Apr 2010 | Canada | December 1956 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| FORTIER, Suzanne, Dr RESIGNED | Director | 01 Apr 2000 | 04 Mar 2006 | | November 1949 | 9 Forest Drive, Rr1, Kingston, Ontario K7l 4vl, Canada |
| FOUNTAIN, Karen Iona RESIGNED | Director | 13 Mar 2015 | 30 Jun 2023 | United Kingdom | September 1967 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| HARRIS, Tom RESIGNED | Director | 23 May 2018 | 29 Feb 2020 | Canada | November 1953 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| HARRISON, Alan James RESIGNED | Director | 01 Aug 2011 | 31 Jul 2016 | Canada | November 1947 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| JOHNSON, Lewis David RESIGNED | Director | 10 Jan 1996 | 02 Jul 1998 | | May 1948 | International Study Centre, Herstmonceux Castle, Hailsham, East Sussex, BN27 1RP |
| LAI, Poh Lim RESIGNED | Nominee Director | 25 Feb 1994 | 27 Jun 1994 | | March 1957 | 24 Redwood Drive, Wing, Buckinghamshire, LU7 0TA |
| LESSARD, Gregory Joseph John RESIGNED | Director | 02 Jul 1998 | 06 Jun 2000 | | December 1952 | Castle Shop, Herstmonceux Castle Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| MACNAMARA, William Donald RESIGNED | Director | 10 Jan 1996 | 02 Jul 1998 | | January 1934 | 185 Ontario Street Apt 1203, Kingston Ontario, K7l 2y7 Canada, FOREIGN |
| MONTGOMERY, Alexander RESIGNED | Director | 27 Jun 1994 | 31 Aug 2013 | England | January 1949 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| O'NEILL, Patrick James, Dr RESIGNED | Director | 01 Jul 2000 | 26 Jun 2002 | | August 1945 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| SILVERMAN, Robert, Dr RESIGNED | Director | 01 May 2010 | 31 Jul 2011 | Canada | August 1943 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| STANLEY, Bruce Edward, Dr RESIGNED | Director | 25 Nov 2011 | 12 Feb 2014 | United Kingdom | September 1951 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| TRENOWDEN, Brenda Dianne Hebb RESIGNED | Director | 27 Jun 1994 | 29 Apr 2016 | United Kingdom | July 1967 | Herstmonceux Castle, Herstmonceux, Hailsham, East Sussex, BN27 1RN |
| TURPIN, David Howard, Dr RESIGNED | Director | 14 Sep 1999 | 31 Mar 2000 | | July 1956 | 238 Alwington Place, Kingston, Kl7 4p8, Ontario, Canada |
| YEATES, Maurice, Dr RESIGNED | Director | 27 Jun 1994 | 16 Jan 1996 | | May 1938 | Herstmonceux Castle, East Sussex, BN27 1RP |