This book focuses solely on the modern period and begins in 1927. The aim is to orient the reader to continuing themes in the field and to also point any future historian to unresolved historical questions as these appear. The accounts of the development of the coalition of theory and practice, an account of some of the effects of psychology on society is presented via the account of a fictional family the Blacks whose several generations were impacted by the development of psychology from the 1920s. In 1920, in America, psychology was dominated by two main currents. The first was a tendency to reduce life to habit, and the second was to establish differences between humans by test. Within psychiatry, psychology had long had allies, and during the 1930s some powerful ones became associated with psychology and supported its aims to develop a parallel nonmedical psychotherapy system. The year 1945 saw the culmination of many developments in psychology since the 1920s, which led to two major coalitions being formed. The first of these was represented in the reorganization of the American Psychological Association (APA). The 1950s, in American society as well as psychology, were characterized by two pairs of opposites: liberty versus repression and conformity versus creativity. The 1960s were brought to the United States on television. In the 1980s, the APA added a division of clinical neuropsychology, another specialty area where the advances in both cognitive and brain studies translated into an acceptable medical support occupation for psychologists. The Big 5 Personality Theory began to gather wide recognition in the 1990s. Positive psychology promised an opportunity to focus study on some important and neglected aspects of human life.