Leadership is an integral component of the human experience and of practical importance to all. For nearly 25 years, the multiple editions of Hackman and Johnson’s outstanding work have been the backbone of leadership courses at hundreds of colleges and universities. The authors extend this tradition of excellence in the Sixth Edition, which continues to serve as a valuable catalyst for generating new insights, debating controversial issues, and contributing to the ongoing dialogue on leading and following. Hackman and Johnson illuminate our understanding of leadership by approaching it as a communication-based activity. They artfully balance research and theory with practical, real-world suggestions for improving communication competence and leadership effectiveness in small-group, organizational, and public contexts.