An expert on extremism, far-right movements, and youth radicalization, Cynthia Miller-Idriss is the director of research at American University's Center for University Excellence, where she runs the Polarization and Extremism Research and Innovation Lab (PERIL). PERIL addresses issues of youth polarization and extremist radicalization through scalable research, intervention, and public education. In this article, she addresses questions about national and global trends in extremism, how extremists target college students and campuses, and what educators can do to resist and respond to extremist threats.