Justin Sherman

Senior Associate (Non-resident), Intelligence, National Security, and Technology Program
Justin Sherman

Justin Sherman is a nonresident senior associate with the Intelligence, National Security, and Technology Program at CSIS. He is the founder and CEO of Global Cyber Strategies, a D.C.-based research and advisory firm; an adjunct professor at Georgetown University; and a contributing editor at Lawfare. Justin has consulted on projects and programs for organizations such as HBO and DARPA. He is sanctioned by the Russian government. Previously, he taught at Duke University and founded and ran its data brokerage research program. He worked at the Tech, Law & Security Program at American University Washington College of Law, New America, and the Laboratory for Analytic Sciences, among others, and held fellowships at EPIC, Georgetown Law, Duke Law, Stanford’s Starling Lab, and Stanford’s U.S.-Russia Forum. He spent several years as a nonresident senior fellow at the Atlantic Council. He has testified repeatedly to Congress and briefed policymakers around the world. He is the author of Navigating Technology and National Security (Wiley, 2025), on the history and future of U.S. national security regulation of technology and data, and is writing multiple more books, including a book on the data broker industry forthcoming with Bloomsbury. He has written dozens of papers, hundreds of articles for a wide range of publications, and op-ed columns for Slate and Wired. He earned his MA in security studies from Georgetown University and his BS in computer science and his BA in political science from Duke University.

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What Iran and Ukraine Reveal About OSINT in War

The war with Iran and Russia's war on Ukraine hold a critical lesson for the United States: just how little control it may have over how foreign adversaries collect and exploit open-source intelligence against its interests.

Commentary by Justin Sherman — September 22, 2026

The European Front in Commercial Data Exploitation

Commercial location data remains a major hole in European—and especially in American—security that adversaries such as Russia and China are primed to exploit.

Commentary by Justin Sherman — September 8, 2026