From his modest headquarters in Crown Heights, Brooklyn, the Rebbe advised some of the world's greatest leaders and shaped matters of state and society. Statesmen and artists as diverse as Ronald Reagan, Robert F. Kennedy, Yitzchak Rabin, Menachem Begin, Elie Wiesel, and Bob Dylan span the spectrum of those who sought his counsel. The Rebbe was the only rabbi ever to receive the Congressional Gold Medal, and to have an American national day, Education and Sharing Day, proclaimed in his honor. No one has succeeded him in his position. Nevertheless, twenty years after his death, his movement has doubled in size, spreading to more than eighty countries, and his impact resonates still. But what was the secret of the Rebbe's success and influence? What principles of leadership guided him? And how did he rally such extraordinary devotion and resolve?