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William Bartholomew
Microsoft
Director of Public Policy
William Bartholomew is Director of Public Policy in Microsoft’s Office of Responsible AI, working across engineering, AI governance, standards, and public policy. He focuses on agentic AI, evaluation and assurance, transparency, incident response, and translating regulatory requirements into practical governance.
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Previously, he held software engineering and product roles at Microsoft and GitHub, with experience in cybersecurity, open source, and software supply chains.
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He co-chairs MLCommons’ Safety Working Group, is Co-Vice Chair of IEEE-USA’s AI Policy Committee, and belongs to OECD.AI’s Expert Group on AI Incidents. He has contributed to a range of technical and policy publications, authored a technical book on software engineering infrastructure, and holds a patent related to cloud security.
