Katherine Zimmerman is a senior analyst and the al Qaeda and Associated Movements Team Lead for the American Enterprise Institute’s Critical Threats Project. Her work has focused on al Qaeda’s affiliates in the Gulf of Aden region and associated movements in western and northern Africa. She specializes in the Yemen-based group, al Qaeda in the Arabian Peninsula, and al Qaeda's affiliate in Somalia, al Shabaab. Katherine has testified in front of Congress and briefed Members and congressional staff, as well as members of the defense community. She has written analyses of U.S. national security interests related to the threat from the al Qaeda network for the Weekly Standard, National Review Online, and the Huffington Post, among others. Katherine graduated with distinction from Yale University with a B.A. in Political Science and Modern Middle East Studies.