Guy Rosen

Guy Rosen announced his departure from Meta after nearly 13 years with the company, where he served as Chief Information Security Officer. Rosen joined Meta through the 2013 acquisition of Onavo, the analytics company he co-founded, and rose to become one of the most senior security executives in the industry.

His exit opened one of the most consequential CISO seats in the world — responsibility for security across Facebook, Instagram, and WhatsApp — which Meta filled the following month with the appointment of Assaf Keren. Thirteen years is an extraordinary tenure in a role where industry averages run closer to three.

According to Calcalist, Rosen said in an internal message that he would remain for several months to support a smooth handover. Bloomberg reports that Meta has started a search for a replacement and that Rosen will remain at the company until then. Meta says that as CISO, Rosen oversees safety and security, including combating on-platform abuse and protecting the security of its products, infrastructure and company information. Calcalist reports that Rosen has held the Chief Information Security Officer post since 2022, leading cybersecurity across Meta's global infrastructure. Calcalist also reports that Rosen started and led internal AI transformation efforts at Meta over the past year.

Before becoming CISO, Calcalist reports, Rosen served as Vice President of Product Management, in charge of combating abuse on Meta's platforms, and before that he led global growth initiatives. Bloomberg reports that Rosen previously oversaw election integrity work at Meta Platforms Inc. and is departing in the coming months. According to Meta, Rosen has more than two decades of experience in product management, software development and cyber security. Meta says Rosen was co-founder and CEO of Onavo, the company whose acquisition brought him to Meta in 2013.

Calcalist reports that Rosen and Roi Tiger met during military service in Unit 8200 and afterwards both worked at Dov Moran’s startup Modu. Calcalist reports that Onavo was acquired in 2013 after gaining millions of users, and that it became the foundation of the Meta R&D center in Israel, which employs hundreds of workers today.

Meta says its Security team is spread across company offices around the world, in Washington DC, Singapore, New York, Seattle and London. According to Meta, its Security Engineering organization is centralized around four areas covering program and operations, measurement and validation, detection and response, and prevention.