The 15 articles in this theme issue celebrate the one-hundredth anniversary of the New York Library Association (NYLA), which was founded by Melvil Dewey. These articles provide an overview of the past, present, and future of NYLA and its constituent interest groups, are: (1) "The New York State Library Centennial" (James Corsaro); (2) "Melvil Dewey and the Origins of NYLA" (Wayne A. Wiegand); (3) "NYLA at Half Century" (Richard D. Johnson); (4) "No, She Doesn't Have a Library Degree" (Dadie Perlov); (5) "New York Library Association--Governance" (Ruth A. Fraley); (6) "NYLA's Role in Library Legislation: Gaining Resources for Information and Library Service" (Joan Neumann); (7) "SLMS (School Library Media Section)/NYLA: What Was, What Is, What Will Be" (Julia C. Van de Water); (8) "Public Libraries Section: From Signatures to Synergy" (Marie Bruce Bruni); (9) NYLA's Academic and Special Libraries Section: Enthusiasm for the Future" (Janet M. Welch); (10) "Section on Management of Information Resources and Technology (SMART): A History, 1957 to 1990" (Ellen C. Rappaport and Teresa Strozik); (11) "Diversity--The Challenge for NYLA's Reference and Adult Services Section" (Jeanne M. Biggins); (12) "Youth Services: Cultivators, Educators, Motivators!" (Iris Bartkowski); (13) "NYLA By the Year 2000" (Susan Lehman Keitel); (14) "Documenting NYLA History: The NYLA Archives" (Frederick Bassett); and (15) "Summary and Evaluation of the New York State LSCA (Library Services and Construction Act) Program, FY 1989." (SD)