Robert O'Callahan

Robert O'Callahan is a software engineer focused on debugging tools, program analysis, and systems software. He created the rr record-and-replay debugger, co-founded Pernosco, and previously worked as a Distinguished Engineer at Mozilla and as an engineer at Google DeepMind. Since resigning from Google in September 2026, he has continued maintaining rr and Pernosco while exploring new work in debugging and AI.

Career

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Google DeepMind

Until Present

Software Engineer

Worked on tools for hardware chip design and AI-related infrastructure. Resigned from Google on September 24, 2026.

Carnegie Mellon University

Ph.D. in Computer Science

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Robert O'Callahan

Google DeepMind

Carnegie Mellon University

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