I wish to thank the Department of Philosophy, the Committee on the Conceptual Foundations of Science, the Division of Humanities (all at the University of Chicago), and an anonymous donor for financial support that made the Steinfest possible. André Carus and Abner Shimony also deserve special thanks for their help with this volume. André, the President of Open Court Publishing Company as well as Howard's doctoral student, was enthusiastic from the beginning about the prospect of publishing a Festschrift for him, and smoothed the way for me at every turn. Abner, Howard's close friend and collaborator, agreed without hesitation when I asked him to write a (second) essay for this volume to serve as its introduction. His appraisal of the special character of Howard's work is surely one of the highlights of the volume.