For a long time, the security profession has lacked a comprehensive text addressing the fundamentals of protecting people, assets, and organizations. Security: An Introduction by Philip Purpura, CPP, is that book. Purpura has written a work that can be used as a text for the student studying security or in a criminal justice program, as a reference book for security specialists, and as a guide for organizations. He draws on his vast experience as a security professional to provide an exhaustive security curriculum for students, instructors, seasoned security professionals, and administrators alike. … Purpura has provided the security community with a thorough and well-organized text that addresses every aspect of security in a definitive way. This book, likely to become an influential one, could be a useful resource for both students and security practitioners. —David Sayer, Owner of Orion Security Consulting, in Security Management, July 2011