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Prof David Chadwick has been working in identity management for over 20 years and has written over a 100 papers on the topic. He was the chief architect and designer of the PERMIS open source authorisation system that supported SAML and X.509 attribute certificates.
More recently he has been an invited expert to the W3C Verifiable Credential Working Group and is a co-author of the Proposed Recommendation "Verifiable Credentials Data Model".