The book "Epistemic Logic and the Theory of Games and Decisions" is the result of a conference that took place in January 1994 at the Centre International de Recherches Mathématiques in Marseille. It addresses the interface between game theory and epistemic logic, a research field that has been gaining importance for two decades. The aim of the conference was to bring together experts from various disciplines such as economics, mathematics, philosophy, and computer science to further explore the connections between these two areas. The editors have strived to provide a comprehensive and precise representation of this promising research field, rather than merely publishing the usual conference proceedings. The book reflects current developments and challenges in the research on knowledge and belief, pursued by both game theorists and decision theorists. It is a valuable resource for anyone interested in the theoretical foundations and practical applications of these disciplines.