| Company | Timeline | Status | |
| Ledmark Ltd Director • Scientist | 1 Apr 2010←15 Years→Current | Active | |
| Siltech Limited Director • Scientist | 25 Jan 2006←17 Years→6 Dec 2023 | Active | |
| Siltech Limited Secretary • Scientist | 25 Jan 2006←17 Years→6 Dec 2023 | Active | |
| Datalase Ltd Director • Scientist | 22 May 1991←10 Years→28 Aug 2001 | Active | |
