The epistemology of testimony is a rapidly developing area in contemporary analytic philosophy. In this first thorough survey of the recent debate on the subject, Axel Gelfert provides an in-depth introduction to what has become one of the liveliest debates in contemporary epistemology. Covering existing literature and major debates, discusses the epistemic status of testimony-based beliefs, relates changes to relevant developments in other areas and offers a critical perspective on current and future research trends. Devoting space to both the applications of social epistemology and the larger conceptual issues of knowledge, Gelfert not only introduces the epistemology of testimony; he offers an up-to-date introduction to epistemology. Equipped with a mix of study questions, examples, and suggestions for further reading, students of contemporary epistemology will find this a reliable guide to studying testimony as a source of knowledge.