Abstract: This book includes 19 essays on the theory of knowledge by leading philosophers in the field. Its essays cover all the key areas in the field while making original contributions. Written in a manner accessible to advanced undergraduates as well as graduate students and professionals in philosophy, the book explains the main ideas and problems of contemporary epistemology while avoiding technical detail. Contributing to contemporary debates over the analysis, sources, and limits of human knowledge, the book represents such central topics as the nature of epistemic justification, the Gettier problem, skepticism, epistemic rationality, the internalism-externalism debate, scientific knowledge, a priori knowledge, virtues in epistemology, epistemological duties, epistemology and ethics, mind and knowledge, the role of explanation in knowledge, epistemology in the philosophy of religion, and formal problems about knowledge. The various discussions share a concern for conceptual clarity and argumentative rigor in epistemology. The book ends with substantial bibliography on epistemology.

Keywords: a priori knowledge, epistemic duty, epistemic virtue, epistemology, externalism, Gettier problem, internalism, justification, knowledge, Paul Moser, philosophy, rational belief, rationality, skepticism, warrant