From the Introduction: This volume of selected papers of Jacob Wolfowitz is published to honor the 70th birthday of this leader of research in statistical inference and information theory...We have made an attempt to organize the material into sections based on subject matter. Since Wolfowitz's many interests have persisted over time, the sections do not represent chronological divisions...We have tried to choose the papers we regarded as most important among Wolfowitz's work in terms of their further influence, or sometimes a paper that contains what we found a striking idea of him. A further consideration was the lucidity of his explanations that we mentioned in describing his teaching; some of his papers contain intuition of heuristics that no statistician should miss.