| COUPLAND, Rebecca ACTIVE | Secretary | 25 Nov 2020 | | | | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| DEANE, Patrick, Dr ACTIVE | Director | 01 Mar 2020 | | Canada | December 1956 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| GIRVIN, Scott ACTIVE | Director | 30 Jun 2023 | | England | December 1977 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| KNOWLES, James Hastings Lewis ACTIVE | Director | 29 Apr 2016 | | England | May 1963 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| MOSEY, Nicholas, Dr ACTIVE | Director | 03 Mar 2025 | | Canada | May 1978 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| PURVIS, Joshua Casey Dennis ACTIVE | Director | 27 Sep 2013 | | England | September 1972 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| TIERNEY, Ann ACTIVE | Director | 13 Feb 2026 | | Canada | April 1964 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| COOKE, Heather RESIGNED | Secretary | 19 Aug 1993 | 01 Dec 1997 | | | Box 430, Verona, Ontario, KOH 2WO |
| CORLETT, Jennifer Anne RESIGNED | Secretary | 23 Nov 2012 | 26 Sep 2014 | | | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| JANIEC, Donna RESIGNED | Secretary | 01 Mar 2000 | 01 Nov 2004 | | | 1188 Gladstone Way, Kinston, Ontario, K7P 2J4, Canada |
| MCDOUGALL, Elaine RESIGNED | Secretary | 01 Dec 1997 | 01 Mar 2000 | | | 245 Collingwood Street, Kingston Ontario K7l 3x9, Canada, FOREIGN |
| MONTGOMERY, Karilene RESIGNED | Secretary | 29 Jun 2007 | 31 May 2009 | | | 6 Rideau Street, Kingston, Ontario K7k 2z6, Canada |
| MUIR, Merrilees RESIGNED | Secretary | 01 Nov 2004 | 28 Jun 2007 | | | 146 Collingwood Street, Kingston, Ontario K7l 3x5, Canada |
| O'BRIEN, Katherine RESIGNED | Secretary | 01 Jul 2009 | 23 Nov 2012 | | | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| STEWART, Lori Ann RESIGNED | Secretary | 26 Sep 2014 | 24 Nov 2020 | | | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| SISEC LIMITED RESIGNED | Nominee Secretary | 15 Jul 1993 | 01 Jul 1996 | | | 21 Holborn Viaduct, London, EC1A 2DY |
| TYROLESE (SECRETARIAL) LIMITED RESIGNED | Secretary | 01 Jul 1996 | 25 Sep 2014 | | | 66, Lincoln's Inn Fields, London, WC2A 3LH, United Kingdom |
| ANDERSON, David, Dr RESIGNED | Director | 01 Mar 2004 | 25 Sep 2015 | Canada | August 1944 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| BACON, Benoit-Antoine RESIGNED | Director | 01 Aug 2016 | 22 May 2018 | Canada | August 1972 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| BALDWIN, Darryl George RESIGNED | Director | 01 Mar 2004 | 16 Mar 2013 | Italy | April 1949 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| BARNARD, David Thomas, Dr RESIGNED | Director | 16 Aug 1993 | 12 Sep 1994 | | August 1951 | 863 Safari Drive, Kingston Ontario, Canada, FOREIGN |
| BOGGS, Andrew Michael RESIGNED | Director | 13 Mar 2015 | 21 Nov 2023 | England | February 1973 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| BROOK, Richard Kiel RESIGNED | Director | 15 Jul 1993 | 01 Jan 1996 | | August 1959 | 20 Paynesfield Avenue, East Sheen, London, SW14 8DW |
| COWAN, John Scott RESIGNED | Director | 01 Oct 1995 | 01 May 1997 | | August 1943 | 1311 Channelview Road, Kingston, Ontario, K7L 4V1, Canada |
| DEANE, Patrick, Dr RESIGNED | Director | 01 Jul 2005 | 30 Apr 2010 | Canada | December 1956 | 3724 Moreland Dixon Road, Rr\2, Inverary, Ontario K0h 1xo, Canada |
| DEN OTTER, Sandra, Dr. RESIGNED | Director | 21 Nov 2023 | 01 Jul 2025 | Canada | July 1963 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| EVANS, Matthew RESIGNED | Director | 21 Nov 2023 | 29 Nov 2024 | Canada | January 1966 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| FORTIER, Suzanne, Dr RESIGNED | Director | 01 Apr 2000 | 30 Jun 2005 | | November 1949 | 9 Forest Drive, Rr1, Kingston, Ontario K7l 4vl, Canada |
| FOUNTAIN, Karen Iona RESIGNED | Director | 14 Nov 2014 | 30 Jun 2023 | United Kingdom | September 1967 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| FRASER, Roderick Douglas RESIGNED | Director | 12 Sep 1994 | 01 Oct 1995 | | July 1940 | 84 Beverley Street, Kingston, Ontario, Canada |
| FRASER, Roderick Douglas RESIGNED | Director | 16 Jul 1993 | 16 Aug 1993 | | July 1940 | 84 Beverley Street, Kingston, Ontario, Canada |
| HARRIS, Tom RESIGNED | Director | 23 May 2018 | 29 Feb 2020 | Canada | November 1953 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| HARRISON, Alan James RESIGNED | Director | 01 Aug 2011 | 31 Jul 2016 | Canada | November 1947 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| HORTON, Joseph Hugh RESIGNED | Director | 29 Sep 2016 | 30 Jun 2017 | Canada | August 1969 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| LUCE-KAPLER, Rebecca, Dr RESIGNED | Director | 17 May 2019 | 21 Nov 2023 | Canada | May 1954 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| MACMILLAN, Janet Mary RESIGNED | Director | 15 Jul 1993 | 08 Apr 2005 | | April 1953 | Wilson Place 4 The Stables, Kiln Lane Stowlangtoft, Bury St Edmunds, Suffolk, IP31 3JY |
| MUMM, Susan Ellen Doreen RESIGNED | Director | 25 Sep 2015 | 30 Jun 2016 | Canada | January 1961 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| O'BRIEN, Kathy RESIGNED | Director | 07 Jun 2018 | 09 Nov 2018 | Canada | June 1968 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| SHANKLAND, Michael David RESIGNED | Director | 01 Jan 1996 | 26 Sep 2014 | United Kingdom | September 1939 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| SILVERMAN, Robert, Dr RESIGNED | Director | 01 May 2010 | 31 Jul 2011 | Canada | August 1943 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| TRENOWDEN, Brenda Dianne Hebb RESIGNED | Director | 22 Mar 2013 | 29 Apr 2016 | United Kingdom | July 1967 | Herstmonceux Castle, Hailsham, East Sussex, BN27 1RN |
| TURPIN, David Howard, Dr RESIGNED | Director | 01 May 1997 | 01 Apr 2000 | | July 1956 | 238 Alwington Place, Kingston, Kl7 4p8, Ontario, Canada |