Amos Tversky was a towering figure in the field of cognitive psychology and in the decision sciences. His research had enormous influence; he created new areas of study and helped transform related disciplines. His work was innovative, exciting, aesthetic, and ingenious. This book brings together forty of Tversky’s original articles, which he and the editor chose together during the last months of Tversky’s life. Because it includes only a fragment of Tversky’s published work, this book cannot provide a full sense of his remarkable achievements. Instead, this collection of favorites is intended to capture the essence of Tversky’s phenomenal mind for those who did not have the fortune to know him, and will provide a cherished memento to those whose lives he enriched.