| Company | Timeline | Status | |
| The Twentieth Century Society Director • Architectural Historian | 28 Jul 2007←5 Years→1 Jun 2013 | Active | |
| Bubba Elvis Limited Secretary • Architectural Historian | 23 Feb 2001←23 Years→1 May 2024 | Active | |
| Bubba Elvis Limited Director • Architectural Historian | 23 Feb 2001←23 Years→1 May 2024 | Active | |
| Society Of Architectural Historians Of Great Britain(The) Director • Architectural Historian | 17 Sep 1993←2 Years 11 Months→5 Sep 1996 | Active | |
