| Company | Timeline | Status | |
| Halcrow Management Sciences Limited Director • Chartered Engineer | 21 Dec 1992←10 Years→16 May 2003 | Dissolved | |
| Sir William Halcrow & Partners Limited Director • Chartered Engineer | 15 Nov 1991←7 Years→24 May 1999 | Active | |
| Sir William Halcrow & Partners Limited Director • Unreported | 1 Jan 1970←29 Years→24 May 1999 | Active | |
