| Company | Timeline | Status | |
| Tetra Tech Limited Director • Chartered Engineer | 10 Nov 2006←1 Year 7 Months→1 Jul 2008 | Active | |
| Dna-Rda Limited Director • Chartered Engineer | 7 Jun 2002←23 Years→Current | Active | |
| Dna-Rda Limited Secretary • Chartered Engineer | 7 Jun 2002←23 Years→Current | Active | |
Wyg 22 Limited Director • Chartered Engineer | 5 Jul 1995←11 Years→10 Nov 2006 | Dissolved | |
