The private thoughts, emotions, hopes, and frustrations contained in this collection of letters written by key figures in psychology provide rich insight into the development of the field. From John Locke writing parenting advice in 17th century Holland to Kenneth B. Clark responding to the impact of his research on the 19th century Brown v. Board decision, this book illustrates the history of the psychology in a direct, engaging manner. Using primary source materials such as letters and journal entries, Ludy Benjamin, one of the leading historians in the field, provides students with a unique view of the story of psychology. The first chapter features an introduction to historiography, focusing on how historians use manuscript collections in their work. The fifteen chapters of letters include chapter-opening material that explains the historical context, brief annotations to help clarify the content of the letters, and an epilogue that concludes these important stories in psychology. This new edition adds more insightful annotations by Dr. Benjamin, giving greater life and dimension to the learning about the people and ideas that have influenced the development of psychology.