Phil Ridley is based in the UK. He works in a team of Applications Performance Engineers which form part of Arm's overall involvement in HPC. This team consists of 2 based in the UK, 2 in France and 3 in the US. Each member specialises in their own particular applications domain including: CFD, climate, oil and gas, and the physical sciences. The main aim of this team is to help people get the best out of Arm based HPC hardware. This might include performance projections for new or unreleased hardware, applications performance tuning, tuning system parameters, or mentoring at hackathons and other events.