| Company | Timeline | Status | |
| Operational Research Society Director • Applied Mathematician | 1 Jan 1995←11 Months→18 Dec 1995 | Active | |
| Eudoxus Systems Limited Director • Unreported | 23 Dec 1993←32 Years→Current | Active | |
| George Starkey Hut Limited Director • Mathematician | 23 Feb 1992←6 Years→25 Nov 1998 | Active | |
