| Company | Timeline | Status | |
| Birtley Courtyard Management Limited Director • Managing Director | 23 Sep 2011←11 Years→16 Jun 2023 | Active | |
| Knight Audio Technologies Limited Director • Technical Director | 14 Jan 2008←17 Years→Current | Active | |
| Richard Matthews Associates Limited Director • Technical Director | 1 Apr 2000←24 Years→7 May 2024 | Dissolved | |
