| Company | Timeline | Status | |
| Halcrow Water Services Limited Director • Company Director | 30 Sep 1998←8 Years→31 Jul 2007 | Dissolved | |
| Halcrow (Consulting Engineers & Architects) Limited Director • Chartered Engineer | 1 Sep 1998←8 Years→31 Jul 2007 | Active | |
| Halcrow Group Limited Director • Chartered Engineer | 1 Aug 1998←9 Years→31 Jul 2007 | Active | |
| Sir William Halcrow & Partners Limited Director • Chartered Engineer | 15 Nov 1991←13 Years→6 Dec 2004 | Active | |
| Sir William Halcrow & Partners Limited Director • Unreported | 1 Jan 1970←34 Years→6 Dec 2004 | Active | |
