As our nation progresses from one crisis to the next and trust in institutions erodes, Americans are looking for new, visionary leadership. As we have seen the exemplary courage and leadership of Ukraine’s President Volodymyr Zelensky, we know that his development as a leader was revealed by the unimaginable experience of war. In his new book Hearts Affected by Fire: How Great Leaders Are Made, David Jergen, a key White House adviser to four presidents from both parties, describes the elusive qualities that define a true leader, through historical examples and scholarly research. As director of the Center for Public Leadership at Harvard’s Kennedy School, he has drawn on his extensive experience in public life to provide a definition of this indispensable trait. He considered his approach philosophical, how to direct him to the achievement of purpose and direction for human endeavors.