During September 2025, Brian Smith enhanced the mfem/mfem repository by implementing PETSc version-aware compatibility for matrix shell operations. He focused on updating the MatShellSetOperation API integration in C++, introducing runtime checks and explicit function-pointer casting to support both legacy and newer PETSc installations. This approach maintained consistent matrix shell behavior across different environments, reducing the risk of deployment regressions. Brian’s work demonstrated a strong understanding of version compatibility and API integration, ensuring that the updated codebase aligned with existing build and validation processes. The solution provided a maintainable path forward for ongoing support of PETSc-based matrix operations in C++.