Dr Mansfield's expertise is in the performance evaluation of biometric systems. His involvement in biometrics commenced in 1996, when he was Technical Manager of the EC's BioTest project, seeking to establish and promote objective methodologies for assessing the performance and security of biometric systems.

This work has continued to the standardisation of test methodologies in the ISO/IEC SC37 Biometric Standards committee, where he is Principal UK Expert and editor of the standard ISO/IEC 19795 Biometric Performance Testing and Reporting, Part 1 - Principles and Framework, and Part 6 - Methodologies for Operational Evaluation. Tony has been involved in many evaluations of biometric systems, ranging from inhouse scenarion evaluations at the National Physical Laboratory, to larger-scale pilots for automated border-control.