| Company | Timeline | Status | |
| The Welsh Mines Preservation Trust Director • University Staff | 13 Jun 1998←2 Years 5 Months→25 Nov 2000 | Active | |
| The AMLWCH Industrial Heritage Trust Limited Director • Ret. Lecturer | 1 Oct 1997←23 Years→8 Feb 2021 | Active | |
| Gwynedd Archaeological Trust Limited Director • Retired | 30 Sep 1991←24 Years→7 Sep 2016 | Active | |
| Gwynedd Archaeological Trust Limited Director • Unreported | 1 Jan 1970←46 Years→7 Sep 2016 | Active | |
