Harvard Business Review Book Series Widely acknowledged as the world"s foremost authority on leadership, John Kotter has devoted his remarkable career to studying organizations and those who run them, and his bestselling books and essays have guided and inspired leaders at all levels. Here, in this collection of his acclaimed Harvard Business Review an ides, is an astute assessment of the real work of leaders, as only John Kotter can offer. To complement these articles, Kotter also contributes a new introduction, a thoughtful reflection on the themes that have developed throughout his work.