Jonathan Katz is a professor in the Department of Computer Science of the Volgenau School of Engineering at George Mason University where he conducts research on cryptography and cybersecurity. In 2013–2019 he was director of the Maryland Cybersecurity Center at the University of Maryland.

Katz's research interests lie broadly in the areas of cryptography, computer and network security and complexity theory, with his most recent work focusing on secure multi-party computation, database privacy and the science of cybersecurity. He has co-authored the textbook Introduction to Modern Cryptography (2007), which has been used by colleges and universities throughout the world and published more than 100 scientific articles. He has also done extensive consulting work for U.S. government agencies and private corporations, mostly involving cryptographic protocols and algorithms.