| Adrian Adams | Director | 30 Apr 1999 | 8 Jun 2001 | British | 74 years |
| Anna Mari Scheiffele | Director | 9 May 2018 | 31 Oct 2021 | Finnish | 51 years |
| Barak Avraham Palachi | Director | 14 May 2017 | 19 Mar 2018 | Israeli | 51 years |
| Benjamin James Michael Holgate | Secretary | 22 Jun 2011 | 31 Jan 2016 | - | - |
| Chinmay Umesh Bhatt | Director | 1 Sept 2020 | 31 May 2022 | Dutch | 52 years |
| Christopher David Snook | Director | 10 Mar 2016 | 31 May 2017 | British | 72 years |
| Daniel Vasella | Director | 1 Oct 1995 | 13 Feb 1997 | British | 72 years |
| David Thomas Ashton | Director | 23 Jan 2001 | 27 Sept 2001 | British | 66 years |
| Edgar Fullagar | Director | 1 Apr 1992 | 1 Jul 1994 | British | 86 years |
| Edgar Fullagar | Director | 7 Apr 1997 | 23 Apr 2002 | British | 86 years |
| Edgar Humberto Arrocha | Director | 26 Aug 2014 | 15 Aug 2016 | Usa | 55 years |
| Eduard Gerhard Krops | Director | 1 May 1993 | 26 Aug 1993 | Dutch | 80 years |
| Eric Cornut | Director | 1 Feb 2007 | 24 Jan 2013 | Swiss | 68 years |
| Erwin Schillinger | Director | 1 Sept 1992 | 1 May 1993 | Swiss | 82 years |
| Frederic Marcel Benoit Guerard | Director | 6 Sept 2012 | 31 Mar 2015 | French | 53 years |
| Gordon John Cummins | Director | 20 May 2004 | 1 Feb 2006 | South African | 55 years |
| Guido Angelo Giovanni Guidi | Director | 24 Jan 2013 | 18 Jan 2017 | Italian | 72 years |
| Hans Kindler | Director | 24 Apr 1997 | 11 Dec 2000 | Swiss | 87 years |
| Harry Werner Kirsch | Director | 20 Jun 2013 | 10 Jul 2018 | Dutch | 60 years |
| Haseeb Ahmad | Director | 28 Mar 2017 | 1 Apr 2021 | British | 49 years |
| Helen Roberts | Secretary | 11 Mar 2008 | 22 Jun 2011 | British | - |
| Hugh Michael O'dowd | Director | 31 Mar 2015 | 16 Sept 2016 | American | 60 years |
| Humphrey Peter Rang | Director | 1 Jun 1992 | 7 Apr 1997 | British | 89 years |
| Jacques Racloz | Director | 1 Jul 1994 | 31 Oct 1997 | Swiss | 84 years |
| James Clifford Youmans | Director | 24 Apr 1997 | 4 Jun 1997 | American | 78 years |
| Jason Mark Brooks | Director | 9 May 2019 | 8 Apr 2025 | British,australian | 53 years |
| Jean-jacques Charhon | Director | 1 Mar 2006 | 15 May 2007 | French | 60 years |
| Joerg Reinhardt | Director | 26 Jan 1999 | 21 Mar 2005 | German | 69 years |
| John Symon | Director | 6 Nov 1997 | 31 Aug 1999 | Australian | 85 years |
| Jonathan Richard Symonds | Director | 31 Mar 2010 | 20 Jun 2013 | British | 66 years |
| Lluis Prat | Director | 22 May 2007 | 10 Mar 2016 | British | 73 years |
| Ludwig Norbert Michel Hantson | Director | 21 Mar 2005 | 1 Feb 2007 | Belgian | 63 years |
| Marie-andree Renee Gamache | Director | 29 Jun 2022 | 31 Oct 2024 | Canadian | 50 years |
| Marie-france Tschudin | Director | 18 Jan 2017 | 22 May 2019 | Swiss | 54 years |
| Martin Christopher Batzer | Director | 1 Oct 1995 | 13 Feb 1997 | Swiss | 72 years |
| Max Link | Director | 1 Apr 1992 | 26 Aug 1993 | Swiss | 85 years |
| Michael John Fahey | Director | 30 Nov 2001 | 20 May 2004 | British | 60 years |
| Oriane Fanny Lacaze | Director | 15 Aug 2016 | 9 May 2019 | French | 46 years |
| Paul Richard Edward Thirkettle | Secretary | 1 Apr 1992 | 5 Jun 1997 | British | - |
| Peter Schlienger | Director | 1 Sept 1992 | 1 Oct 1995 | Swiss | 84 years |
| Raymund Breu | Director | 11 Dec 2000 | 31 Mar 2010 | Swiss | 80 years |
| Rebecca Ann Weston | Secretary | 1 Feb 2016 | 1 Jan 2021 | - | - |
| Rene Wack | Director | 1 Apr 1992 | 31 Dec 1992 | Swiss | 91 years |
| Reto Ernst Brandli | Director | 28 Jan 2000 | 1 Mar 2006 | Swiss | 64 years |
| Richard John Brazier | Director | 22 Feb 2006 | 1 Jul 2009 | British | 60 years |
| Richard Metcalfe | Director | 1 Feb 1993 | 31 Dec 1997 | British | 88 years |
| Richard Samuel Cullen | Secretary | 1 Jan 2021 | 20 Jul 2022 | - | - |
| Roland Kreissig | Director | 14 Dec 2021 | 31 May 2022 | German | 55 years |
| Rolf Soiron | Director | 1 Apr 1992 | 20 May 1993 | Swiss | 80 years |
| Sally Jane Jennings | Secretary | 31 Dec 2000 | 11 Mar 2008 | British | - |
| Sally Jane Shorthose | Secretary | 1 Mar 2000 | 31 Dec 2000 | British | - |
| Sandipkumar Shantilal Kapadia | Director | 3 Apr 2012 | 26 Aug 2014 | American | 55 years |
| Silvio Gabriel | Director | 1 Feb 2001 | 16 Mar 2005 | Swiss | 73 years |
| Stefan Hans Stroppel | Director | 19 Jan 1998 | 23 Jan 2001 | Swiss | 67 years |
| Subhanu Saxena | Director | 22 Apr 2005 | 26 Aug 2009 | British | 61 years |
| Susan Ann Webb | Director | 26 Aug 2009 | 6 Sept 2012 | British | 62 years |
| Teresa Jose | Director | 1 Jul 2009 | 3 Apr 2012 | Indian | 57 years |
| Urs Barlocher | Director | 20 May 1993 | 1 Oct 1995 | Swiss | 83 years |
| Valerie Allsup | Secretary | 5 Jun 1997 | 1 Mar 2000 | British | - |
| William Drummond Paris | Director | 14 Sept 2001 | 22 Apr 2005 | British | 74 years |