James Greenhalgh
Senior Director, Software Product at Arm
Austin, Texas, United States
Summary
👤
Senior🎓
Top SchoolJames Greenhalgh is a senior software product leader with 14 years at Arm, currently heading product for the company’s Cloud AI business from Austin, Texas. He leads cross-stack teams that deliver firmware, kernels, performance libraries, tools and AI framework integrations for Arm AGI CPU and Neoverse CSS platforms, blending hardware-aware engineering with cloud-native requirements. His background as a compiler and performance engineer — including long-standing contributions to the AArch64 GCC port and stewardship of runtimes like OpenJDK, Go and Rust — gives him rare credibility across silicon, toolchains and language runtimes. James is known for translating low-level performance work into reliable, standards-compliant cloud products that boot and scale for hyperscalers. He balances open-source collaboration with proprietary product delivery, ensuring ecosystem partners can migrate and optimize on Arm at scale. His career combines deep technical authorship with product leadership, making him as comfortable reviewing microprocessor design trade-offs as shaping multi-team product strategy.
15 years of coding experience
13 years of employment as a software developer
MEng, Computing, MEng, Computing at Imperial College London
Github Skills (16)
gcc-compiler10
solaris10
gcc10
in-progress8
centos4
gdb4
switch4
oracle-linux4
linux3
security3
oracle2
x861
newlib1
mips1
glibc1
Programming languages (5)
Github contributions (5)
ARM-software/speculation-barrier
Jan 2018 - Jan 2018
This project provides a header file which contains wrapper macros for the __builtin_load_no_speculate builtin function defined at https://www.arm.com/security-update This builtin function defines a speculation barrier, which can be used to limit the conditions under which a value which has been loaded can be used under speculative execution.
Contributions:7 commits, 7 pushes, 3 comments in 26 days
security
illumos/gcc
Jul 2011 - Feb 2020
GCC patched to build illumos, including the patches from Codesourcery/Sun Microsystems used in the 3.4.3 and 4.3.3 shipped with Solaris
Contributions:365 commits in 8 years 8 months
solarisillumosgccgcc-compiler
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