Ash previously lead Arm's global Architecture, Platforms and Open Source Software technical support and training organization; there he acted as trusted advisor to some of Arm's biggest customers, and was one of Arm's lead technical trainers regularly delivering courses on the Arm Architecture to classrooms of engineers.

Ash later joined the Amazon AWS EC2 Kernels & Operating Systems team, and more recently the Apple Platform Kernel team.

There he helped to develop and maintain the Arm Architecture and Apple CPU-specific layers of the XNU kernel running on all Apple devices, and also represented Kernel Engineering during the bring-up of several in-flight Apple Silicon designs, from pre-silicon simulation and FPGA through to prototype and production silicon tapeouts.