Today, threats to the security of an organization can come from a variety of sources — from outside espionage to disgruntled employees and internet risks to utility failure. Reflecting the diverse and specialized nature of the security industry, Security: An Introduction provides an up-to-date treatment of a topic that has become increasingly complex as more vulnerabilities arise. Philip P. Purpura, recently selected by Security Magazine as one of the Top 25 Most Influential People in the Security Industry, shares his 30-plus years of professional experience in the industry to provide basic theory and real-world methodologies that security practitioners can apply to scenarios they encounter. Topics discussed in this broad-based text include: The history of security and the role of security professionals Terrorism and national strategies for homeland security Crime prevention through environmental design Violence, theft, and drugs in the workplace Insider threats, pre-employment screening, and executive and personnel protection The security of physical structures Threats to information security, including malware and botnets; and risks to proprietary information and communication Security law and liabilities Investigations, interrogations, and surveillance Risk management, threats from natural disasters, and business continuity/enterprise resilience Critical infrastructures and key national resources The future of security technology Utilizing real-world examples, each chapter begins with learning objectives and a list of key terms and ends with discussion questions, role-playing exercises, and links to relevant websites. The book offers readers a foundation for understanding and implementing best practices for security to more effectively protect people, assets, and organizations.