| Company | Timeline | Status | |
| Ackerman Engineering Limited Director • Engineer  | 13 Mar 1992←33 Years→Current  | Active  | |
| Checkmate Devices Limited Director • Engineer  | 4 Jun 1991←34 Years→Current  | Active  | |
| Ackerman Engineering Limited Director • Engineer  | 1 Jan 1970←55 Years→3 Oct 2025  | Active  | |
| Checkmate Devices Limited Director • Engineer  | 1 Jan 1970←55 Years→3 Oct 2025  | Active  | |
