This book is a useful introduction to information ecosystems and infrastructures, informed by the work of JoAnne Yates, Paul Edwards, Susan Leigh Star, Geoffrey Bowker, and others in business history and the history and sociology of technology. Cortada universalizes his proposed method of understanding information ecosystems as a historical approach by presenting case studies in computing, diplomacy, rural life, and genealogy, and by identifying six questions for historians to ask. These include considering the "vessels ... used to collect and store information in many different societies and times"; the types of information "collected, used, and shared" by and about people; "the patterns of adoption and use of information over time"; how "the use of information [has affected] the work and lives of specific individuals and ... groups"; "what other historical discourses should be viewed as information history"; and "the intrinsic features of facts themselves and how [they] affect the creation and use of other facts" (pp. 9–13). The book’s strengths are its focus on users and the author’s considerable expertise in business and computing history. Recommended.