| Company | Timeline | Status | |
Willis Renewable Energy Systems Limited Director • Engineer | 11 Mar 2008←11 Years→11 Feb 2020 | Dissolved | |
| William Willis & Co Limited Director • Retired Engineer | 31 Dec 1996←29 Years→Current | Active | |
| Willis Heating And Plumbing Co Ltd Director • Engineer | 18 Jan 1990←23 Years→31 Dec 2013 | Active | |
