| Company | Timeline | Status | |
| Celef Audio International Limited Director • Loudspeaker Manufacturer | 14 Jun 1991←30 Years→28 Jun 2021 | Active | |
| Professional Acoustics Limited Director • Loudspeaker Manufacturer | 31 Dec 1990←30 Years→28 Jun 2021 | Active | |
| Proac Limited Director • Loudspeaker Manufacturer | 31 Dec 1990←30 Years→28 Jun 2021 | Active | |
