This valuable collection of biographical sketches illuminates how each director of the National Library of Medicine understood and shaped the crucial task of providing reliable medical information to practitioners and locates the Library in the sweep of the history of American medical practice. -- Rena Selya, PhD, MLIS, Archivist, Historical Conservancy Department, Research Assistant Professor and Associate Director, Program in the History of Medicine The National Librarians of Medicine and Their Predecessors is at once a detailed historical contribution that provides extensive analysis of the library's development and a readable volume that considers political and military contexts. It is an essential book for all who are interested in the evolution of libraries and library history because of the National of Library of Medicine's central role in adopting the new technologies that influence modern librarianship. -- Kathleen de la Peńa McCook, Distinguished University Professor, School of Information, University of South Florida