| Company | Timeline | Status | |
Halcrow Gilbert Associates Limited Director • Chartered Engineer | 1 Dec 1991←2 Years 7 Months→30 Jun 1994 | Dissolved | |
| Sir William Halcrow & Partners Limited Director • Chartered Engineer | 15 Nov 1991←8 Years→1 Nov 2000 | Active | |
| Sir William Halcrow & Partners Limited Director • Unreported | 1 Jan 1970←30 Years→1 Nov 2000 | Active | |
