| Company | Timeline | Status | |
| Chemical Industries Association Limited Director • Executive | 20 Nov 1997←5 Years→21 Nov 2002 | Active | |
| Witton Chemical Co.Limited Director • Executive | 16 Apr 1996←3 Months→23 Jul 1996 | Active | |
| Witton Chemical Co.Limited Director • Manager | 3 Jun 1992←1 Year 10 Months→25 Apr 1994 | Active | |
