| Company | Timeline | Status | |
| Wireless Research Limited Director • Engineer | 23 Feb 1999←22 Years→15 Jun 2021 | Dissolved | |
| Taking Care Personal Alarms Limited Director • Engineer | 24 May 1991←4 Years→16 Jun 1995 | Active | |
| Taking Care Personal Alarms Limited Director • Unreported | 1 Jan 1970←25 Years→16 Jun 1995 | Active | |
