| 1973 | MA in Physics, University of Vienna |
| 1977 | Ph.D. in Physics, King's College, Cambridge University |
| 1978-1984 | Co-founder (later Chairman); Lead, Research and Development team (BBC micro); Head, team ARM micro processor; Acorn Computers, Cambridge |
| 1986 | Vice President Research, Olivetti, Ivrea, Italy |
| Founder Director, Harlequin, Cambridge |
| 1987 | Helped with formation, a joint venture between Acorn and Apple Computers, ARM Ltd, Cambridge |
| 1988 | Founder, Active Book Company, Cambridge |
| 1991 | Co-Chairman and Chief Technology Officer - acquired Active Book Company, EO Incorporated, Mountain View, California |
| 1992 | Founder Director, Vocalis, Cambridge |
| 1993 | Founder and Chairman, Advanced Telecommunications Modules Ltd, Cambridge (changed name to Virata Corporation and merged with Globespan in 2003 and Conexant in 2004) |
| Founder Director, joint venture with E*Trade US. Sold to E*Trade US in 2000, Electronic Share Information Ltd, Cambridge |
| Founder Director - Acquired by CDT, Advanced Displays Ltd, Cambridge |
| Founder Director, SynGenix, Cambridge |
| 1996 | Founder, NetChannel, San Francisco, California (sold to AOL in 1998) |
| since 1997 | Co-founder and Partner, Amadeus Capital Partners Limited |
| 1998 | Co-founder, Cambridge Network Ltd, Cambridge |
