| Company | Timeline | Status | |
| Ymddiriedolaeth Yr Hafod-Hafod Trust Director • Retired | 4 Nov 1994←6 Years→12 Feb 2001 | Dissolved | |
| Gwynedd Archaeological Trust Limited Director • Retired | 30 Sep 1991←9 Years→11 Feb 2001 | Active | |
| The Trust For Welsh Archaeology Director • Retired Government Archaeologist | 8 Sep 1991←7 Years→27 Nov 1998 | Active | |
