Alex Stamos is joining Cognition as its new chief security officer; he most recently oversaw security at AI security startup Corridor and SentinelOne
Alex Stamos has joined Cognition as the AI coding unicorn's new chief security officer. … The hire suggests security has become a major focus for the fast-growing company.
AxiosSam Sabin
Context & Ripple Effects
Cognition’s $2 billion fundraise at a $48 billion valuation followed a sharp reported increase in run-rate revenue, raising the operational stakes around a company selling AI coding tools. Installing Alex Stamos in the security leadership role makes security a named executive responsibility alongside that growth.
The move fits an emerging leadership pattern among major AI developers: OpenAI brought in Palantir’s former CISO, Dane Stuckey in 2024. Cognition is drawing on Stamos’s recent security work at Corridor and SentinelOne as it builds out its own security function.
First-order effects
Cognition gains a chief security officer with experience spanning AI security and SentinelOne, concentrating accountability for the safety and security issues Stamos said motivated his move.
Cognition’s customers and prospective buyers gain a clearly identified executive owner for security as the company scales its AI coding product.
Second-order effects
OpenAI’s 2024 CISO hire and Cognition’s appointment make senior security leadership a more visible competitive requirement for AI developers selling into security-conscious organizations.
Security teams at AI coding vendors face pressure to turn executive security hires into customer-facing assurance practices, rather than treating security as a back-office function.
Third-order effects
If prominent AI developers continue adding dedicated security executives, rapid commercial scaling will be paired with governance capacity as a core operating requirement, not a later-stage add-on.
The trend: AI developers are formalizing security leadership as autonomous coding systems become more commercially consequential.
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/...
Stoked to welcome @alexstamos as Cognition's new CISO. Alex co-founded iSEC Partners, served as CISO at Yahoo and Chief Security Officer at Facebook, founded the Stanford Internet Observatory, and most recently held senior security roles at SentinelOne. He's joining because AI is…
Couldn't be more excited that @alexstamos is joining Cognition as our CISO. Alex is one of those people that from the moment you meet him you know he is a living legend. Alex led security at Facebook and Yahoo, served as CISO at SentinelOne and has protected some of the world's m…
It's pretty clear that security is going to be one of the most important problems of the next decade. We're building the best team to serve our customers. Yahoo, Facebook, SentinelOne, Zoom... and now, Cognition! Every week, I get more excited about this team :) Welcome, Alex!
The future of software engineering is increasingly coupled with the future of cybersecurity. Incredibly excited to welcome @alexstamos to Cognition to help build that future with us.
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!
Alex is one of the best in the industry, he was CISO at Facebook, SentinelOne, and Yahoo, all during the formidable years. He also teaches cybersecurity at Stanford! I've had the pleasure of knowing him prior to joining, and am super happy to have him on board. I think right now …
I took a class from Alex as an undergrad, and he gave us career advice that stuck with me: “Don't be the plumbing at a company, your work should be part of the main business.” Clearly this is now the case for everyone who sells AI wrt security.