The study of strategic leadership as a formal, analytical concept is relatively new. Therefore, concrete, historical examples of leaders who have wrestled with the width and breadth of strategic-level challenges are of inestimable value. Marshall’s contributions were no accident of history. They resulted from the exercise of effective strategic leadership, consciously and consistently applied across a broad spectrum of activities and interests. This study analyzes the nature and effects of that leadership and captures the magnitude of Marshall’s achievements as a strategic leader during what were frequently regarded as the unglamorous prewar years.