| Company | Timeline | Status | |
| Ballantine Arnold Limited Director • Engineer | 7 Jan 2013←10 Years→18 Jan 2023 | Active | |
| Ballantine Associates Ltd Director • Engineer | 17 Apr 2008←17 Years→Current | Active | |
| Meldon Viaduct Company Limited Director • Bridge Engineer | 24 May 2006←5 Years→1 Apr 2012 | Active | |
