Philip Jessup’s life was richly varied. Scholar, practitioner, teacher, administrator, diplomat, judge, prolific writer—he moved from role to role, displaying in each his abundant gifts of character and intellect. Every new job, each fresh subject was a challenge met with zest and high spirits. As a scholar, he was drawn to the issues of the day. He never hesitated to take sides when he felt he had good grounds to do so. In his classes and writings, he was as concerned with practical action as with new ideas. Endowed with a commanding presence, a remarkably resonant voice and a talent for lucid and lively expression, Jessup had no difficulty in getting the attention of an audience. He used concepts sparingly, but effectively, and he avoided windy rhetoric. On the whole, he favored narrative exposition, particularly highlighting the aims and predicaments of the individual actors. People, it seems clear, were more real to him than the abstractions of law or political theory. He was a stickler for thorough and detailed research, as his judicial opinions and books show. Concrete, unique facts were important to him; he had to get them right. Historical detail and revealing quotations were used by him with telling effect.