WARREN BENNIS distinguished professor of the University of Southern California's Marshall School of Business, is the author of nineteen books, including the best-selling Leaders (with Burt Nanus) and On Becoming a Leader. GRETCHEN M. SPREITZER is assistant professor at the University of Southern California's Marshall School of Business and a faculty affiliate of both the Center for Effective Organizations and the Leadership Institute. THOMAS G. CUMMINGS is the chair of the Department of Management and Organization at the University of Southern California and Executive Director of the Leadership Institute. He is associate editor of the Journal of Organizational Behavior.