Securing diverse and distributed IT environments starts with the identity plane. Modern and evolving security threats are best prevented by securing identity through many layers relying on a Zero Trust model. Zero Trust, by which I mean “trust nothing, verify everything,” can serve as a foundation for the evolution of a modern security perimeter, one virtually drawn around each individual user, from anywhere they log on. By following Zero Trust principles and establishing user identity across devices, programs, and networks, modern enterprises can pursue a security program that is adaptive, contextual, and robust enough to defend against modern threats.