Drawing from decades of research within world-class organizations, the authors show that great leaders excel not just through skill and smarts, but by connecting with others using Emotional Intelligence competencies like empathy and self-awareness. The best leaders, they show, have "resonance"--a powerful ability to drive emotions in a positive direction to get results--and can fluidly interchange among a variety of leadership styles as the situation demands. Groundbreaking and timely, this book reveals the new requirements of successful leadership.