John P. Kotter is a graduate of the Massachusetts Institute of Technology and Harvard University. He is the Konosuke Matashusita Professor of Leadership at the Harvard Business School and was one of the youngest people in Harvard history to receive full professorship. Kotter's works include Power and Influence: Beyond Formal Authority, The Leadership Factor and Corporate Culture and Performance.
Spencer Johnson is one of the authors of The One Minute Manager, one of the most successful business self-improvement books of all times. The book has been translated into more than two dozen languages and inspired a series of similar books. Johnson has written other books on his own and with Kenneth Blanchard, his One Minute Manager co-author.
Peter R. Mueller is Division Head, Abdominal Imaging and Interventional Radiology, Department of Radiology, Massachusetts General Hospital and Professor of Radiology, Harvard Medical School, Massachusetts, USA.
Holger Rathgeber is the modern global manager. He works for Beckton Dickinson, one of the world's leading medical technology companies. Rathgeber is from Frankfurt and spent his first professional years in Asia. Since 2004 he has lived in White Plains, New York, with his wife Jutta and sons Daniel and Benny.