Juliette N. Kayyem is the Robert and Renée Belfer Senior Lecturer in International Security at the Harvard Kennedy School, where she also serves as Faculty Chair of the Homeland Security Project. She is a Senior National Security Analyst for CNN and a contributing writer for The Atlantic magazine, focusing on terrorism, disaster preparedness, and national security policy. Kayyem is also the author of Early Warning on Substack and a bestselling author.