Presents a curated selection of thirty-eight letters written by John D. Rockefeller to his son, offering insights into business ethics, leadership, discipline, and personal responsibility. Through reflections on work, wealth, decision-making, and moral conduct, the letters reveal the managerial philosophy and worldview of one of the most influential industrialists in modern history. The book serves as a primary-source perspective on early corporate leadership and the values that shaped large-scale enterprise development