This book offers glimpses into the personal and scholarly lives of 20 giants in the history of psychology. As in the earlier volumes, prominent scholars were invited to prepare chapters on a pioneer who had made important contributions in their own area of expertise. Some of the psychologists described may be the teachers of the instructors who will be the users of this book, potentially providing a personal connection of the pioneers to the students. A special section provides brief portraits of the editors and authors, containing interesting information about the relationship between the pioneers and the psychologists who describe them. Utilizing an informal, personal, sometimes humorous, style of writing, the book will appeal to students and instructors interested in the history of psychology. Each of the five volumes in this series contains different profiles thereby bringing more than 100 of the pioneers in psychology more vividly to life.