Book excerpt: In the World Library of Psychologists series, international experts themselves present career-long collections of what they judge to be their finest pieces - extracts from books, key articles, salient research findings, and their major practical theoretical contributions. Kenneth Gilhooly has an international reputation as an eminent scholar and pioneer in the field of thinking and reasoning. The book covers key works on problem solving, expertise, working memory and thinking, and ageing. A specially written introduction gives an overview of his career and contextualises the selection in relation to changes in the field during this time. The book enables the reader to trace developments in thinking and reasoning over the last forty years.It will be essential reading students and researchers of cognitive psychology interested in the history of thinking and reasoning.