Katherine Zimmerman is a fellow at the American Enterprise Institute (AEI), where she focuses on the global Salafi-jihadi movement and counterterrorism. She has regional expertise on the Middle East, especially Yemen, and on East, North, and West Africa. She advises AEI’s Critical Threats Project. Ms. Zimmerman is a term member of the Council on Foreign Relations and a member of the RESOLVE Network Research Advisory Council. She holds an MA in terrorism, security and society from King’s College London an