| Company | Timeline | Status | |
| Tree Council(The) Director • Horticulture | 9 Nov 1991←10 Years→11 Jul 2002 | Active | |
| Horticultural Trades Association(The) Director • Horticulturist | 24 Oct 1991←1 Year 11 Months→10 Oct 1993 | Active | |
| Hillier Nurseries Limited Director • Director | 14 Mar 1991←4 Years→31 Aug 1995 | Active | |
| Plant Heritage Director • Horticulture | 12 Oct 1988←10 Years→17 Mar 1999 | Active | |
| Tree Council(The) Director • Unreported | 1 Jan 1970←32 Years→11 Jul 2002 | Active | |
