Jonathan Tatum expanded maintainer governance for the CEL C++ module within the grpc/bazel-central-registry repository, focusing on improving project ownership and contributor onboarding. He designed and implemented a process to onboard CEL Team maintainers, clarifying responsibilities and streamlining code review workflows. By leveraging skills in project management, open source collaboration, and Git workflows, Jonathan enabled faster issue triage and more reliable integration of CEL C++ across dependent projects. His work, primarily involving JSON for configuration, addressed maintainability and sustainability challenges by reducing risk through explicit ownership, though the scope was limited to governance rather than direct feature development or bug fixing.