| Company | Timeline | Status | |
| Oldfield Systems Limited Director • Company Director | 1 Apr 2013←6 Years→14 Aug 2019 | Active | |
Micro-Photonics Ltd Director • Director | 4 Apr 2009←4 Years→25 Nov 2013 | Dissolved | |
| Oldfield Light & Sound Limited Director • Director | 5 Dec 2008←10 Years→14 Aug 2019 | Dissolved | |
| Oldfield Systems Limited Director • Scientist | 29 Jan 2007←2 Months→31 Mar 2007 | Active | |
| Oldfield Sciences Limited Director • Scientist | 19 May 2005←14 Years→14 Aug 2019 | Dissolved | |
| Oldfield Systems Limited Secretary • Scientist | 20 Jun 2001←7 Years→12 Jul 2008 | Active | |
