| Company | Timeline | Status | |
| DGCL Technologies Limited Director • Director | 11 Mar 2025←9 Months→Current | Active | |
| David Greenstein Ltd Director • Director | 19 Nov 2010←15 Years→Current | Active | |
| The Varicose Vein Centre Limited Director • Surgeon | 14 Dec 2005←17 Years→13 Jun 2023 | Dissolved | |
