Cognition co-founder Walden Yan welcomes Alex Stamos

Walden Yan (Cognition co-founder) welcomes Stamos, listing his security roles at Yahoo, Facebook, SentinelOne, Zoom during COVID and the Stanford Internet Observatory, and says he will lead Cognition's focus on security.

Alex had the hardest security jobs of every era: Yahoo, Facebook (nation-states attacking both), SentinelOne, Zoom during COVID, Stanford Internet Observatory.

No one better to loead Cognition's focus on security in this eraa. Couldn't be more excited. Welcome Alex!

Quoting @alexstamos:

There are real safety and security issues raised by AI, but they can be fixed. It's time to get to work instead of freaking out. That's why I'm joining Cognition as CISO. https://x.com/i/article/2104937004668760064

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Archived 2026-09-30 via fxtwitter (unofficial).