| Company | Timeline | Status | |
| Babbageworks Limited Director • Cryptographer/mathematician | 23 Sep 2021←4 Years→Current | Active | |
| Tscheme Limited Director • Mathematician | 13 May 2004←2 Years→1 Jun 2006 | Active | |
| Tscheme Limited Director • Mathematician | 6 Dec 2001←4 Months→14 Apr 2002 | Active | |
