Ken O’Brien worked on the ROCm/ROCR-Runtime repository, focusing on stabilizing cross-GPU buffer sharing by addressing a memory allocation bug that previously limited dmabuf export to only the first GPU. Using C++ and leveraging expertise in GPU programming and low-level memory management, Ken debugged the allocator, validated the solution across diverse multi-GPU hardware topologies, and collaborated with the ROCm driver team to ensure robust integration. This work improved buffer management and scalability for complex configurations, enhancing runtime reliability and broadening hardware support. The depth of the fix demonstrated careful attention to system-level details and a methodical approach to runtime stability.