| Company | Timeline | Status | |
| W.H. Patterson Limited Director • Director | 24 May 2004←21 Years→Current | Active | |
Gladwell Fine Art Limited Director • Fine Art Dealer | 24 Sep 1999←19 Years→23 Apr 2019 | Dissolved | |
| Gladwell & Co Director • Fine Art Dealer | 16 Jun 1997←28 Years→Current | Active | |
