Harry joined the microelectronics research group at Southampton University in 1974 after his first degree at Liverpool University, and was awarded his PhD three years later. The research topic involved optical testing of integrated circuits, and this led to employment at the GEC Hirst Research Centre in Wembley, initially on process engineering techniques for 8um NMOS. He was part of the pioneering team using silicon on sapphire and moved to specialise in circuit design. In 1984 he moved to Acorn Computers Ltd at Cambridge, initially working with a silicon compiler team then latterly in the Advanced R&D group working on the implementation of their new RISC architecture in 3um CMOS. This department split off to become Advanced RISC Machines Ltd in 1990, now Arm Ltd.

Harry worked for Arm till his retirement in 2007, for most of that time in the role of VLSI Design Manager, by which time the company had become very successful and technology had advanced such that he worked on 45nm processes. He has been a member of the IET and IEEE for over 30 years, and was an Arm Fellow in the last few years at Arm. Since retirement he has taken on a number of voluntary jobs, mostly on the Isle of Wight, but also he likes to pass on his experience and has active links with current PhD students in the Electronics and Computer Sciences department.