Peter G. Northouse, PhD, is Professor Emeritus of Communication in the School of Communication at Western Michigan University. Leadership: Theory and Practice is the best-selling academic textbook on leadership in the world and has been translated into 15 languages. In addition to authoring publications in professional journals, he is the author of Introduction to Leadership: Concepts and Practice (now in its sixth edition) and co-author of Leadership Case Studies in Education (now in its fourth edition) and Health Communication: Strategies for Health Professionals (now in its third edition). His scholarly and curricular interests include models of leadership, leadership assessment, ethical leadership, and leadership and group dynamics. For more than 40 years, he has taught courses in leadership, interpersonal communication, and organizational communication on both the undergraduate and graduate levels. Currently, he is a consultant and lecturer on trends in leadership research, leadership development, and leadership education. He holds a doctorate in speech communication from the University of Denver, and master's and bachelor's degrees in communication education from Michigan State University.

Craig E. Johnson (PhD, University of Denver) is professor emeritus of leadership studies at George Fox University in Newberg, Oregon, where he taught undergraduate and graduate courses in leadership, ethics, and management. During his time at the university, he served as founding director of the George Fox Doctor of Business Administration program and chair of the Department of Communication Arts. He is the author of Meeting the Ethical Challenges of Leadership(also published by SAGE)and coauthor, with Michael Z. Hackman, of Leadership: A Communication Perspective.He has published research findings, instructional ideas, and book reviews in the Journal of Leadership Studies,the Journal of Leadershipand Organizational Studies,theJournal of Leadership Education, Academy of Management Learning and Education,the International Leadership Journal,Communication Quarterly, Communication Reports,and other journals. When not teaching or writing, he enjoys working out, reading, fly-fishing, volunteering, watching sports, and spending time with his spouse.