Warren Bennis, University of Southern California
  Interview on co-leadership in Wharton Leadership Digest
Ram Charan, independent author and consultant
Peter Drucker, Claremont Graduate School of Management 
Marshall Goldsmith, independent author, consultant, and coach
Donald Hambrick, Columbia Business School
Rosabeth Moss Kanter, Harvard Business School
Jon Katzenbach, Katzenbach Partners
David Nadler, Mercer Delta Consulting 
David Ulrich, University of Michigan Business School