Sharing expertise gleaned from more than two decades as a library security manager, Graham demonstrates that libraries can maintain their best traditions of openness and public access by creating an unobtrusive yet effective security plan. In straightforward language, the author: (1) Shows how to easily set clear expectations for visitors' behavior; (2) Presents guidelines for when and how to intervene when someone violates the code of conduct, including tips for approaching an unruly patron; (3) Offers instruction on keeping persistent troublemakers under control or permanently barred from the library; and (4) Gives library staff tools for communicating effectively with its security professionals, including examples of basic documentation. "The Black Belt Librarian" arms librarians with the confidence and know-how they need to maintain a comfortable, productive, and safe environment for everyone in the library.