| Company | Timeline | Status | |
| Don Valley Engineering Holdings Limited Director • General Manager | 31 Mar 2010←8 Years→27 Mar 2019 | Active | |
| Torver Engineering Limited Director • General Manager | 14 Dec 2009←7 Years→30 Nov 2017 | Active | |
| Cleeve Materials Handling Limited Director • Company Director | 7 Apr 2009←8 Years→30 Nov 2017 | Active | |
| Don Valley Engineering Group Limited Director • Engineer | 3 Oct 2007←10 Years→30 Nov 2017 | Active | |
| Neecol Limited Director • General Manager | 6 Nov 2000←24 Years→Current | Active | |
| Don Valley Engineering Construction Limited Director • General Manager | 6 Nov 2000←17 Years→30 Nov 2017 | Active | |
Minerals Engineering Society(The) Director • General Manager | 6 Sep 1996←1 Year→12 Sep 1997 | Dissolved | |
| Don Valley Engineering Company Limited Director • Engineer | 29 Oct 1993←24 Years→30 Nov 2017 | Active | |
