DAVID A. NADLER is one of the nation's leading consultants and advisors to corporate executives on the subjects of organizational architecture and organizational change. Since 1980, he has served as CEO of the Delta Consulting Group, Inc. Prior to that, he served on the faculty of the graduate school of business at Columbia University. Nadler has authored or edited more than a dozen books on management, organizational change, and leadership, including Organizational Architecture (1992), Discontinuous Change (1994), and Executive Teams (1997), all from Jossey-Bass.