| Company | Timeline | Status | |
| Calvert Towers Limited Director • Management Consultant | 1 Dec 1996←28 Years→Current | Active | |
| Calvert Towers Limited Secretary • Technical Consultant | 23 Nov 1995←29 Years→Current | Active | |
| Calvert Towers Limited Secretary • Technical Consultant | 23 Nov 1995←29 Years→26 Sep 2025 | Active | |
