Marek Rejman-Greene is the Senior Biometrics Adviser at the Home Office and heads the Biometric Centre of Expertise at the Home Office Scientific Development Branch. This group provides advice and assurance to the biometric programmes of the Home Office, as well as undertaking applied research.

He is a key contributor to SC37, the ISO standards committee for biometrics, acting as the principal national expert to WG4 (Biometric Functional Architecture and Related Profiles).