In the complicated field of American foreign policy, one of the signal successes of the Obama Administration was the work of Secretary of State John Kerry. Kerry emerged as a relentless and tenacious peacemaker during his time in office. He continually showed his willingness to go all-out—use diplomacy, talk to foes, pursue negotiations, issue public pronouncements, take repeated overseas jaunts, and even, on occasion, broadcast threats to help reach sensible objectives. In his efforts, he acted as a progressive and a realist about planetary affairs, especially about the need for diplomacy over war. Kerry, in his way, restored much of America’s influence around the globe and blunted much of the chronic resentment nations have felt toward the United States.