Assaf Keren Appointed New CISO of Meta

Assaf Keren has been appointed the new CISO of Meta, replacing Guy Rosen. Rosen announced his retirement from the company after 13 years. The change was reported by SecurityWeek.

A CISO appointment sits at the top of how a large platform organizes security ownership: policy, incident response, product and infrastructure risk, and how engineering teams are held to security requirements. This handoff is a leadership and accountability change, not a product launch or a published benchmark, so there are no new architecture diagrams, performance numbers, or feature mechanics attached to the announcement itself.

For engineers and builders inside Meta-scale systems, a new CISO often reshapes review gates, threat-modeling expectations, and which security initiatives get staffing and budget. Teams that ship features across identity, messaging, ads, or cloud-adjacent services should expect continuity of existing controls in the near term, with any shift in priorities arriving through updated standards and leadership direction rather than a single public technical release.

In the wider market, major platforms treat the CISO role as a public signal of how seriously they treat safety, privacy, and operational resilience. A 13-year tenure ending in retirement implies a planned transition rather than an emergency replacement, which competitors and partners will read as stability in Meta’s security leadership rather than a crisis-driven reset.

What to watch next is how Keren sets near-term security priorities and whether Meta publishes any change in program focus under the new CISO. Until those priorities are stated, the concrete fact remains the leadership change: Assaf Keren as CISO, Guy Rosen out after 13 years, as reported by SecurityWeek.