This book introduces students to the dynamic and complex enterprise that is homeland security. Using a broad lens, the authors explore key operational and content areas, as well as the practices and policies that are part of an effective homeland security program. With original essays from academics and practitioners, the book encapsulates the breadth of homeland security as it exists today. Topical coverage includes: administration, intelligence, critical infrastructure protection, emergency management, terrorism and counterterrorism, law and policy, technology and systems, strategic planning, strategic communication, civil-military affairs, private sector involvement, environmental security, and public health. Accessible, engaging, and comprehensive, this is an essential resource for courses on homeland security.