Meta confirmed the appointment on July 22, 2026, and Keren will step into the role after a transition period following Guy Rosen's announced departure last month. Rosen originally started at the company in 2013, before its rebranding to Meta, and oversaw critical responsibilities including election security and, later, the integration of AI into company workflows.
Rosen will stick around for several months during a transition period before he leaves Meta later this year. A Meta spokesperson confirmed the plan, which should help keep things steady while Keren gets up to speed.
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Keren posted on LinkedIn that "few organizations carry the responsibility Meta does," and added that his priority is to "deeply integrate security and trust into the company's artificial intelligence systems and core infrastructure."
He starts at Meta this week. The timing is tight given the planned departure of Rosen, but the overlap period gives Keren time to learn the landscape before he takes full control.
Meta's security leadership has been under the spotlight for years, particularly after the Cambridge Analytica scandal and ongoing concerns about election interference, hate speech, and data breaches. Guy Rosen, who oversaw the company's integrity and security efforts, steered Meta through high-stakes U.S. and global elections and the integration of AI into internal business operations. His departure marks a transition as the company doubles down on artificial intelligence - both as a product and as a tool inside its own operations.
Keren's background at PayPal, where he dealt with financial fraud and user trust at scale, and at Qualtrics, which manages sensitive enterprise data, suggests Meta is prioritizing experience with high-trust, high-stakes environments. The new CISO's explicit focus on embedding security into AI infrastructure signals that Meta recognizes the unique risks posed by generative AI, including model manipulation, data leakage, and automated misinformation. Investors and regulators will be watching closely to see how Keren shapes Meta's security posture in the coming quarters. With Meta investing heavily in AI assistants and generative features, Keren's emphasis on building security from the ground up aligns with industry best practices and growing regulatory expectations around algorithmic accountability.
The smooth transition with Rosen staying on for several months should help maintain continuity, but the challenge ahead is substantial given the rapid pace of AI development and increasing scrutiny from governments worldwide. These pressures are compounded by Meta's sprawling platform ecosystem, which spans billions of users across Facebook, Instagram, WhatsApp, and Messenger, each presenting unique attack surfaces. Keren will also need to navigate evolving data privacy regulations in Europe, the U.S., and elsewhere while ensuring Meta's security posture keeps pace with its aggressive AI roadmap.
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