| Agnes Wasem | Director | 11 Jul 2022 | 22 Aug 2023 | Swiss | 42 years |
| Andres Braebeck Letmathe | Director | 9 Jan 2004 | 31 Aug 2012 | Austrian | 60 years |
| Beat Christoph Kraehenmann | Director | 5 Mar 2014 | 11 Jul 2022 | Swiss | 68 years |
| Benan Cuma | Director | 1 Nov 2020 | 17 Jul 2024 | Turkish | 51 years |
| Christiane Schumacher | Director | 10 Jun 2016 | 1 Mar 2017 | German | 49 years |
| Claude Georges Charles Schreiner | Director | 5 Apr 2001 | 31 May 2007 | French | 83 years |
| David James Jackson | Director | 13 Oct 1997 | 30 Sept 2001 | British | 78 years |
| Fritz Gerber | Director | 13 May 1997 | 22 Feb 1999 | Swiss | 96 years |
| Henri Bernard Meir | Director | 13 May 1997 | 22 Feb 1999 | Swiss | 89 years |
| James Karin Jnr Lennertz | Director | 1 Mar 2002 | 9 Jan 2004 | American | 72 years |
| Jayson Donald Alexander Dallas | Director | 1 Jan 2013 | 24 Jul 2015 | Usa | 57 years |
| Jennifer Elizabeth Cook | Director | 1 Sept 2013 | 1 Aug 2017 | Us | 60 years |
| John Mcmillan Melville | Director | 14 Jun 2000 | 31 Dec 2012 | British | 74 years |
| Kezia Jayn Vitug | Director | 1 Mar 2019 | 31 Oct 2020 | American,filipino | 49 years |
| Mandy Elizabeth Robertson | Secretary | 9 Jul 2018 | 12 Mar 2019 | - | - |
| Mark Lloyd Williams | Director | 31 Aug 2012 | 30 May 2014 | Uk | 54 years |
| Olufunke Abimbola | Secretary | 22 Jun 2015 | 6 Jul 2018 | - | - |
| Peter Hug | Director | 1 Jun 2007 | 1 Sept 2013 | Swiss | 67 years |
| Richard David Daniel | Secretary | 13 May 1997 | 22 Jun 2015 | British | - |
| Richard William Erwin | Director | 1 Sept 2015 | 30 Jul 2025 | British | 58 years |
| Timothy Edwin Kelly | Director | 1 Mar 2017 | 31 Dec 2018 | American | 53 years |
| Tobin Charles Schilke | Director | 4 Aug 2014 | 10 Jun 2016 | American | 51 years |
| Vic Ackermann | Director | 13 Oct 1997 | 14 Jun 2000 | Australian | 81 years |
| William Murray Burns | Director | 22 Feb 1999 | 5 Apr 2001 | British | 78 years |
