| DAVIES, Amy ACTIVE | Secretary | 23 Nov 2020 | | | | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| NICHOLSON, Simon ACTIVE | Director | 31 Dec 2014 | | England | July 1975 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| PEACOCK, David ACTIVE | Director | 01 Oct 2019 | | United Kingdom | February 1973 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| TEMUCIN, Ebru Can ACTIVE | Director | 23 Jun 2017 | | England | October 1972 | Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom |
| FLETCHER, Michael Cole RESIGNED | Secretary | | 28 Mar 2000 | | | 7 Arundel House, Courtlands, Richmond, Surrey, TW10 5AS |
| PAGE, Nicola Ann RESIGNED | Secretary | 19 Nov 2007 | 12 Aug 2010 | | | 3 Falcon Way, Welwyn Garden City, Hertfordshire, AL7 1TW |
| POMEROY, Valerie Ann RESIGNED | Secretary | 28 Mar 2000 | 06 Jun 2003 | | | PO BOX 20980 Oriel House, 16 Connaught Place, London, W2 2ZB |
| ROBINSKI, Richard RESIGNED | Secretary | 12 Aug 2010 | 23 Nov 2020 | | | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, England |
| O H SECRETARIAT LIMITED RESIGNED | Secretary | 06 Jun 2003 | 19 Nov 2007 | | | PO BOX 20980 Oriel House, 16 Connaught Place, London, W2 2ZB |
| AHMAD, Haseeb RESIGNED | Director | 12 Aug 2010 | 23 Mar 2012 | United Kingdom | March 1976 | Schering Plough House, Falcon Way Shire Park, Welwyn Garden City, Hertfordshire, AL7 1TW |
| BOUSFIELD, Keith RESIGNED | Director | 23 Mar 2012 | 31 Dec 2014 | United Kingdom | November 1959 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, England |
| COUTTS, Gordon RESIGNED | Director | 22 Apr 2008 | 19 Nov 2009 | | December 1960 | 3 Falcon Way, Welwyn Garden City, Hertfordshire, AL7 1TW |
| EHREN, Stijn Michiel RESIGNED | Director | 22 Apr 2008 | 13 Dec 2011 | Netherlands | April 1968 | 3, Falcon Way, Welwyn Garden City, Hertfordshire, AL7 1TW |
| FLETCHER, Michael Cole RESIGNED | Director | | 28 Mar 2000 | | March 1942 | 7 Arundel House, Courtlands, Richmond, Surrey, TW10 5AS |
| HILADO, Maria Teresa RESIGNED | Director | 27 Nov 2008 | 02 Jul 2009 | | June 1964 | 3, Falcon Way, Welwyn Garden City, Hertfordshire, AL7 1TW |
| HOUSON, Louise Jane RESIGNED | Director | 22 Sep 2016 | 01 Oct 2019 | United Kingdom | July 1976 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| KHANNA, Deepak Kumar RESIGNED | Director | 12 Aug 2010 | 30 Jun 2014 | United Kingdom | December 1965 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, England |
| KOEHLER, Steven Hubrig RESIGNED | Director | 22 Apr 2008 | 12 Aug 2010 | Usa | August 1950 | 3 Falcon Way, Welwyn Garden City, Hertfordshire, AL7 1TW |
| LEONARD, Melissa RESIGNED | Director | 11 Dec 2013 | 15 Oct 2016 | United Kingdom | August 1972 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, England |
| MCDOWELL, Mark Andrew Charles RESIGNED | Director | 12 Aug 2010 | 31 Dec 2013 | United Kingdom | January 1955 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, England |
| MILLER, Russell Hugh RESIGNED | Director | 28 Mar 2000 | 26 May 2005 | | May 1945 | PO BOX 20980 Oriel House, 16 Connaught Place, London, W2 2ZB |
| NALLY, Michael Thomas RESIGNED | Director | 30 Jun 2014 | 30 Sep 2016 | United Kingdom | January 1976 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| POLZ, Gertraud RESIGNED | Director | 22 Sep 2016 | 23 Jun 2017 | England | May 1974 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| RADDER, Henricus Marie Joseph RESIGNED | Director | 01 Feb 1992 | 01 Jan 2002 | | November 1943 | Bakenbergseweg, Bakew, 6814 Arnhem, FOREIGN, The Netherlands |
| VAN ALPHEN, Gerardus Clemens Maria RESIGNED | Director | 01 Mar 2004 | 14 Feb 2006 | | March 1948 | Organon Laboratories Ltd, Unit 330 Cambridge Science Park, Miltonroad Cambridge, Cambridsgeshire, CB4 0FL |
| VAN DEN WIJNGAARD, Johannes Adrianus Gerardus Wilhelmus RESIGNED | Director | 14 Feb 2006 | 22 Apr 2008 | | November 1960 | Unit 330 Cambridge Science Park, Milton Road, Cambridge, Cambridgeshire, CB4 0FL |
| VAN DEN WIJNGAARD, Johannes Adrianus Gerardus Wilhelmus RESIGNED | Director | 01 Mar 2004 | 01 Nov 2005 | | November 1960 | Unit 330 Cambridge Science Park, Milton Road, Cambridge, Cambridgeshire, CB4 0FL |
| VAN DONGEN, Emilius Hubertus Adrianus Maria RESIGNED | Director | 01 Nov 2005 | 22 Apr 2008 | | October 1958 | Unit 330 Cambridge Science Park, Milton Road, Cambridge, CB4 4FL |
| VAN OS, Aart RESIGNED | Director | 01 Jan 2002 | 01 Mar 2004 | | October 1955 | Organon Labs Ltd, Unit 23, Cambridge Science Park, Cambridge, CB4 OFL, Uk |
| VEERMAN, Gijsbert RESIGNED | Director | | 02 Feb 1992 | | January 1930 | Dennenoordpark 7 6862, Oosterbeck, FOREIGN, Holland |
| WHITE, Katherine Elizabeth RESIGNED | Director | 31 Dec 2014 | 18 Mar 2016 | United Kingdom | March 1958 | West Hill, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU |
| O H DIRECTOR LIMITED RESIGNED | Director | 26 May 2005 | 19 Nov 2007 | | | PO BOX 20980, Oriel House 16 Connaught Place, London, W2 2ZB |