Assaf Keren’s Post

After two decades defending some of the world's most critical platforms - from PayPal to Qualtrics to government networks - against daily probes, I've learned trust is not a feature, it's foundational. When systems hold, nobody notices. When they break, nothing else matters. I've spent my career defending people and their data from persistent threats. Today, I'm excited to share that I've joined Meta as its next Chief Information Security Officer, transitioning into the role after Guy Rosen departs later this year. Here's the thesis I'm bringing with me to Meta: Meta works at the frontier of technology. It's where the future is being built and where the stakes are highest. Few organizations carry the responsibility Meta does. Billions of people trust its platforms for how they connect, communicate, and, increasingly, use AI in their daily lives. Protecting that trust, the security of the systems, the integrity of the platform, and the safety of the people on it, is one of the most consequential jobs in our industry. And it is getting harder, because we are wiring AI into the world’s load-bearing systems and we must secure them just as fast. The capability curve is nearly vertical. The trust curve is not. Closing that gap, building security and trust into these systems from the start rather than bolting it on after, and being able to prove they’re worthy of the trust we place in them, is one of the defining challenges of this era.  This is primarily an engineering challenge - one that has to be solved at the same frontier and the same scale as AI. That is why I'm joining Meta. Building AI at the frontier means building the trust infrastructure for it at the same frontier, with the same seriousness, at a scale that touches billions of people. There are few places in the world where that problem is bigger, harder, or more consequential. The role brings together everything I've spent my career on: security, systems, and the human work of earning confidence. I don’t step into this lightly, or alone. Guy Rosen built something rare here: a security organization with real depth, real craft, and a culture that takes this work as seriously as it deserves. I have enormous respect for what he and this team have built, and I’m humbled to carry it forward. The people I’ve met are exactly the kind you want beside you on the hardest problems. The thing I’m most excited about is them. I’m looking forward to spending the next few months working closely with Guy and the team to ramp up in my new role. More soon. For now: grateful, energized, and ready to earn my place.