| Company | Timeline | Status | |
| Greenwich Yacht Club Limited Director • Architect | 15 Feb 2025←8 Months→Current | Active | |
| Greenwich Yacht Club Limited Director • Architect | 9 Dec 2018←1 Year→15 Dec 2019 | Active | |
| Jeffery Associates Architecture Limited Director • Architect | 29 Sep 2015←10 Years→Current | Active | |
| Jeffery Associates Architects Limited Director • Architect | 5 May 1999←16 Years→26 May 2015 | Dissolved | |
| Timothy Mark Limited Director • Architect | 5 May 1999←26 Years→Current | Active | |
| Chisenhale Art Place Ltd Director • Architect | 30 Nov 1993←11 Months→31 Oct 1994 | Active | |
