In his magnum opus Principles of Psychology, first released in 1890, William James wrote the definitive volume of Psychology's early history. Using colorful language and metaphor, James crafted intuitively coherent descriptions of the types of phenomena (selective attention and multiple memory models and associative principles, to name three among hundreds of other constructs) that psychologists, especially cognitive psychologists, would come to take as primary areas of study. And Psychology was not even James' day job! He was trained as a good-for-nothing philosopher, and a large portion of his scholarly activities were in advancing his different philosophical positions, as distinct from the concerns of mere experimental psychologists.
Fun fact! Prior to Brielle and I, William James held the distinction as the most eminent 'Will' and 'James' in the history of Psychology. How the times have changed!