| Company | Timeline | Status | |
| Tarahill Limited Director • Marketing Director | 9 Feb 1995←30 Years→Current | Active | |
| Frontier Environmental Limited Director • Scientific Co-ordinator | 22 Apr 1992←33 Years→Current | Active | |
| The Society For Environmental Exploration Director • Science Administrator | 30 Jun 1991←32 Years→26 Sep 2023 | Dissolved | |
