In this issue of JAMA, we are publishing, with our sincere thanks, the names of all peer reviewers who completed manuscript reviews for JAMA in 2011.1 These peer reviewers, who represent virtually every medical specialty and subspecialty, nearly every area of medical research, and numerous countries around the world, provide high-quality, insightful, and rigorous critiques of submitted manuscripts. We extend our appreciation to all peer reviewers for providing their clinical, scientific, and methodological expertise and by doing so, for being instrumental in maintaining and enhancing the clinical relevance and scientific quality of articles published in JAMA. Although peer review is often considered a relatively unsung academic responsibility, we hope that by publishing the names of all JAMA peer reviewers they will receive the recognition they greatly deserve for their indispensable contributions.