| Company | Timeline | Status | |
| Tarahill Limited Director • Unreported | 9 Feb 1995←30 Years→Current | Active | |
| Frontier Environmental Limited Secretary • Unreported | 22 Apr 1992←11 Months→7 Apr 1993 | Active | |
| The Society For Environmental Exploration Director • Science Administrator | 30 Jun 1991←32 Years→26 Sep 2023 | Dissolved | |
| Frontier Environmental Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
