Matthew is a cryptographer and academic at Johns Hopkins University and has designed and analyzed cryptographic systems used in wireless networks, payment systems and digital content protection platforms. A key focus of his work is in the promotion of user privacy. He has an extensive following on X/Twitter (140K followers) and his blog covers important areas of cryptography:

https://blog.cryptographyengineering.com/author/matthewdgreen/

His research has been cited over 15,000 times and includes work on Zerocash, Zerocoin and Identity Based Encryption (IBE), and more recently on privacy-aware signatures:

https://scholar.google.co.uk/citations?hl=en&user=X0XWAGkAAAAJ