Hedgehogs and Foxes - Character, Leadership, and Command in Organizations - A. Zaleznik

In this compelling look at charismatic leaders and their leadership styles, Abraham Zaleznik asserts that leaders are either 'hedgehogs,' who view leadership as a single-minded track driven by unwavering rules, or 'foxes,' who assess and re-evaluate their goals and strategies based on ever-changing factors in business, politics, and culture.