| Ailison Louise Mitchell | Secretary | 18 Sept 2003 | 20 Jan 2004 | British | - |
| Antonio Smeraglinolo | Director | 6 Jul 2009 | 1 Feb 2011 | United States | 74 years |
| Bradley G. Graham | Director | 1 Feb 2011 | 10 Sept 2013 | American | 55 years |
| Brendan Gerald Burke | Director | 7 Sept 2016 | 6 May 2021 | American | 53 years |
| Christopher C. Bernhardt | Director | 17 Mar 2014 | 7 Sept 2016 | American | 70 years |
| David Frank Plester | Director | 24 Aug 2010 | 7 Jul 2015 | British | 62 years |
| Geoffrey Michael Adams | Director | 9 Jul 2015 | 31 Dec 2023 | British | 63 years |
| Glen P. Schuhmacher | Director | 10 Sept 2013 | 7 Sept 2016 | American | 58 years |
| Graham David Leeming | Director | 20 Jan 2004 | 11 Nov 2009 | British | 58 years |
| Graham David Leeming | Secretary | 22 Dec 2005 | 11 Nov 2009 | British | - |
| Hlm Secretaries Limited | Corporate Secretary | 20 Jan 2004 | 7 Nov 2007 | - | - |
| James Benjamin Bambrough | Director | 11 Jun 2019 | 31 Dec 2019 | British | 52 years |
| Judith Ann Hodgson | Director | 18 Sept 2003 | 20 Jan 2004 | British | 76 years |
| Kate Ellen Butler | Director | 7 Jul 2015 | 30 Apr 2019 | British | 66 years |
| Kevin Richard Thomas | Director | 20 Jan 2004 | 3 Jul 2006 | British | 72 years |
| Larry Goldman | Director | 6 May 2021 | 30 Nov 2023 | American | 68 years |
| Mark David Lawton | Director | 17 Mar 2014 | 7 Jul 2015 | British | 54 years |
| Michael Fellowes | Director | 3 Jul 2006 | 24 Aug 2010 | British | 68 years |
| Michael John Thorne | Director | 5 Dec 2005 | 1 Feb 2011 | Usa | 69 years |
| Robert Benton Hille Ii | Director | 5 Apr 2017 | 8 Oct 2020 | American | 48 years |
| Robert Bernard Rosenkranz | Director | 5 Dec 2005 | 30 Jun 2008 | Usa | 87 years |
| Rory Fisher | Director | 30 Jun 2008 | 16 Apr 2009 | Us | 75 years |
| Stanley Alan Royall Billiald | Secretary | 7 Nov 2007 | 1 Jul 2009 | Other | - |
| Steven Landrey | Secretary | 11 Nov 2009 | 3 Sept 2014 | - | - |
| Steven Landrey | Director | 11 Nov 2009 | 17 Mar 2014 | British | 57 years |
| Steven T Schorer | Director | 1 Feb 2011 | 17 Mar 2014 | American | 68 years |
| Steven T Schorer | Director | 7 Sept 2016 | 5 Apr 2017 | American | 68 years |
| Valerie Francine Anne Teller | Secretary | 1 Jul 2009 | 27 Jul 2012 | British | - |