The first chapter, “History of Baldwin’s ideas,” is portrayed to provide the reader with Baldwin’s primary assumptions and concepts in the field of psychology. The reader will find in this chapter information about James Mark Baldwin, his work, and the seed of the creation of a genetic psychology, unfolding in the science of development as it is known today. The writing aims to make Baldwin easier to understand by introducing actual psychological concepts, his influence on well-known developmental psychologists, and his philosophical background. The chapter is divided into three sections: (1) Merging the field between culture and development, (2) The interdisciplinary realm of developmental science: the seeds of genetic psychology, and (3) Imitation in the history of science. Each section furnishes the reader with a general framework for understanding Baldwin’s work and his legacy in developmental science. Section “History of Baldwin’s Ideas” is designed to provide an understanding of how culture and development intersect in Baldwin’s work, his theoretical production, and his role in modern psychology. Section “Merging the Fields Between Culture and Development” exemplifies some of Baldwin’s main concepts, such as circular reaction and organic selection, drawing on a range of interdisciplinary fields in Baldwin’s time. The third section rescues the uses of imitation in the history of the humanities and social sciences, focusing especially on contemporary authors from Baldwin’s time, the French tradition, and the philosophical ground in Spinoza. This historical coverage is an overview of Baldwin’s context, influences, and theoretical production.