“In this marvelous book, one of the world’s most distinguished psychologists synthesizes cutting-edge research to illuminate how biology and environment jointly shape human psychology. The book reveals deep erudition, yet is written in an engaging and accessible style. Anyone keen to learn what science has revealed about human nature will be captivated.”
— Richard J. McNally, Ph.D., Department of Psychology, Harvard University, Author of Panic Disorder: A Critical Analysis and Remembering Trauma
“An excellent read—highly informative and accessible. Jerome Kagan provides a broad overview of the importance of individual differences early in life in the formation of adult personality. The book encompasses the worlds of psychology, genetics, and neuroscience…in a manner that is readily understood to readers of varied backgrounds. In addition, Professor Kagan provides in-depth discussion of the influence of temperament on achievement and psychopathology.”
— Professor Nathan A. Fox, University of Maryland-College Park
"Jerome Kagan, with his usual brilliance, separates the biology and psychology of temperament to unravel the complexity of why we act and react the way we do. If you want to understand why you or your child is anxious, easy-going, a worrier, compulsive, feels guilty or entitled and more, you must read Kagan’s discoveries about the brain’s role and the factors that influence it."
— Susan Newman, Ph.D., Social psychologist, and author of Parenting An Only Child: The Joys and Challenges of Raising Your One and Only.