| Company | Timeline | Status | |
| Tetra Tech International Development Limited Director • Company Director | 7 Nov 2025←2 Months→Current | Active | |
| Coffey Geotechnics Limited Director • Director | 28 Apr 2025←8 Months→Current | Active | |
| Tetra Tech Consulting (Ni) Limited Director • Director | 23 Apr 2025←9 Months→Current | Active | |
| Tetra Tech UK Consulting Group Limited Director • Director | 22 Apr 2025←9 Months→Current | Active | |
| Tetra Tech Group Limited Director • Director | 14 Apr 2025←9 Months→Current | Active | |
| RPS Environmental Management Limited Director • Unreported | 17 Nov 2023←2 Years 2 Months→Current | Active | |
| Tetra Tech Consulting Limited Director • Unreported | 17 Nov 2023←2 Years 2 Months→Current | Active | |
| Wellchild Director • Managing Director | 23 Apr 2019←6 Years→Current | Active | |
