Rhea Siers

Senior Legal and Policy Fellow
[email protected]

Areas of Expertise

cybersecurity, intelligence/national security, terrorism, counterterrorism

Rhea Siers served for over thirty years in the US Intelligence Community, including as Deputy Assistant Director for Policy at the National Security Agency. Ms. Siers served in a variety of operational, policy and legal areas and was a member of the Defense Intelligence Senior Executive Service. Her courses include subjects relating to Cybersecurity, Intelligence, Terrorism, Counterterrorism, and Non-State Actors. Ms. Siers is currently the Senior Fellow in Law and Policy at the Institute for Information and Infrastructure Protection (I3P) at GWU and previously Scholar in Residence at the GWU Center for Cyber and Homeland Security. She is co-author of two books, one on Cyberwarfare and the other on different approaches to analyzing terrorism. Named as a "Legal Cyber Trailblazer" by the National Law Journal, she is also a consultant for a law firm on cybersecurity. Ms. Siers is also a regular contributor to the The Cipher Brief.


Current Research

cyber warfare


BA, Barnard College; MSc, London School of Economics, JD, Washington College of Law (American University), MIPP, Elliott School (GWU)


The Theory and Practice of Terrorism (Nova Publishers)

Cyberwarfare: Understanding the Law, Policy and Technology (Thomson Reuters)

"Omar Hammami: A Study in Radicalization" Journal of Behavioral Science and the Law

"Cyber Deterrence: A Strategic Imperative" Wall Street Journal

Classes Taught

Cyber Threats, Terrorism, Responses to Terrorism, Non-State Actors, Intelligence in the Middle East