Book excerpt: It has been more than a decade since the first edition of PeterKoestenbaum's landmark book Leadership: The Inner Side ofGreatness was published. Since that time world events havecaused a dramatic shift in how we think about our lives and ourwork. Now we grapple with the fundamental questions. How can welive a courageous life and manage anxiety? Is it possible to reachgreater heights of ethics and responsibility? Peter Koestenbaum, the preeminent business philosopher, has beena trusted mentor to business leaders worldwide. In this thoroughlyrevised edition of his classic book he shares his wisdom about thefundamental nature of leadership and shows what it takes to becomean exceptional and passionate leader in today's complex world. Atthe very heart of the book is his Leadership Diamond model—aparadigm that challenges managers to transform their thinking andapproach everything with fresh effectiveness in order to reapricher results and become great leaders.