| Anne Rosalind Bateson | Nominee Secretary | 10 Nov 1999 | 17 Dec 1999 | British | - |
| Brian Andrew Butzelaar | Secretary | 1 Apr 2005 | 15 Jan 2016 | British | - |
| Cornelis Karel Voskuil | Secretary | 17 Dec 1999 | 31 Jul 2004 | Netherlands | - |
| Guylain Turgeon | Director | 1 Jul 2001 | 21 Apr 2013 | Canadian | 64 years |
| Herman Noyen | Director | 15 Aug 2017 | 14 Oct 2020 | Belgian | 61 years |
| Jeroen Laurentius Johannus Rijk | Director | 21 Apr 2013 | 1 Jul 2022 | Dutch | 54 years |
| John Christopher Howard Beard | Director | 17 Dec 1999 | 22 Feb 2005 | British | 68 years |
| Jorge Luis Consiglieri Munoz | Director | 21 Feb 2005 | 15 Jan 2016 | Peruvian | 62 years |
| Kristin Frans Amanda Louisa De Prins | Director | 20 Jul 2016 | 15 Aug 2017 | Belgian | 56 years |
| Nils Robert Nord | Director | 1 May 2001 | 31 Mar 2002 | Swedish | 58 years |
| Poh Lim Lai | Nominee Director | 10 Nov 1999 | 17 Dec 1999 | British | 69 years |
| Randall James Wall | Director | 17 Dec 1999 | 1 Jul 2001 | Canadian | 67 years |
| Sam Wyant | Director | 1 Jul 2022 | 31 Dec 2024 | American | 55 years |
| Simon Den Tuinder | Director | 1 Mar 2004 | 30 Jun 2004 | Dutch | 60 years |