If you visit any online or neighborhood bookstore, you will see dozens of books about leadership, all of them - except Rudy Giuliani's Leadership - written by corporate or policy wonks who wrote their treatises based more on high-falutin' theory than on "real life" experience. In fact, Giuliani’s 2005 book is the only book on this subject that doesn’t have a lengthy gobbledygook subtitle, but rather stands on that single word alone to describe what millions of people around the world wanted to know after September 11, 2001: How did he rise to the occasion to lead a city—indeed a...