| Company | Timeline | Status | |
| Environmental Building Solutions Limited Director • Building Health & Conservation  | 9 Dec 1998←26 Years→Current  | Active  | |
| Hutton + Rostron Environmental Investigations Limited Director • Mycologist  | 21 Nov 1992←9 Months→1 Sep 1993  | Active  | |
Fungal Control Systems Limited Director • Scientist  | 23 Feb 1992←1 Year 6 Months→1 Sep 1993  | Dissolved  | |
