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Justin Richer is a security architect, software engineer, standards editor, and systems designer with over two decades of industry experience. He is the lead author of OAuth2 In Action and contributor to OAuth 2.0 and OpenID Connect. Justin is the editor of a variety of standards including GNAP, HTTP Message Signatures (RFC9421), Vectors of Trust (RFC8485), and OAuth extensions for dynamic registration (RFC7591, RFC7592), token introspection (RFC7662), and rich authorization requests (RFC9396). Justin is a co-author to US government standards NIST SP 800-63, FIPS201, and NIST SP 800-217.