| Company | Timeline | Status | |
| Tank Gauging Systems & Instrumentation Limited Director • Instrument Technician  | 24 Mar 2003←3 Years→26 Jan 2007  | Dissolved  | |
| Tank Gauging Systems & Instrumentation Limited Secretary • Instrument Technician  | 24 Mar 2003←4 Years→30 Apr 2007  | Dissolved  | |
| T.J. Williams Limited Director • Instrument Technician  | 7 Aug 1998←27 Years→Current  | Active  | |
| T.J. Williams Limited Secretary • Instrument Technician  | 7 Aug 1998←27 Years→Current  | Active  | |
