Few figures in modern diplomatic history have generated as much debate as Henry Kissinger. Celebrated by some as a master strategist and dismissed by others as a ruthless practitioner of realpolitik, Kissinger straddled the worlds of scholarship and action in ways that continue to shape discussions of global affairs. This chapter explores how a man renowned for his theoretical analyses of power structures simultaneously conducted real-world negotiations that altered Cold War dynamics from Southeast Asia to the Middle East. It dives into Kissinger’s complex persona, equal parts brilliant tactician, secretive manipulator, and relentless practitioner of “balance of power” diplomacy, and examines the major successes and failures that cemented his controversial legacy. In reviewing his role in key negotiations such as the Vietnam peace talks, the opening of China, the 1973 Yom Kippur War ceasefire, and détente with the Soviet Union, we seek to identify the enduring lessons and cautionary tales Kissinger left behind. His penchant for secrecy and “shuttle diplomacy” added new dimensions to diplomatic practice, while his disregard for moral concerns in certain interventions drew fierce criticism. By analyzing his distinctive blend of preparation, back-channel maneuvering, and calculated power plays, this chapter offers insight into what modern negotiators can, and perhaps should not, adopt from Kissinger’s repertoire. Ultimately, understanding Kissinger’s methods requires a recognition of how one individual’s extraordinary intellect and strategic audacity interacted with a uniquely fraught historical context, leaving a legacy that continues to inform international negotiation theory and practice.