Marc Sageman, an expert on al Qaeda and related terrorist organizations, discusses how people end up on the path to political violence in a post-9/11 world. His talk builds upon his best-selling book, "Understanding Terror Networks" and is based upon his recent publication, "Leaderless Jihad." Sageman is an independent researcher on terrorism and the founder of Sageman Consulting, LLC. He holds various academic positions at the George Washington University, the University of Maryland and national think tanks, like the Foreign Policy Research Institute, the Center for Strategic and International Studies, and the Homeland Security Policy Institute.