| Company | Timeline | Status | |
| Pcgusl Limited Director • Consulting Engineer | 23 Jan 2003←1 Year 6 Months→16 Aug 2004 | Dissolved | |
Seagen Limited Director • Consulting Engineer | 2 May 2002←2 Years 3 Months→16 Aug 2004 | Dissolved | |
Altoona Ltd Director • Mechanical Engineer | 15 Feb 2002←15 Years→30 Jan 2018 | Dissolved | |
| D C White Consulting Engineers Limited Director • Mechanical Engineer | 18 May 2000←17 Years→16 Jun 2017 | Dissolved | |
