Vaill, Robert K. Greenleaf, Larry C. Spears and Peter B.
"Robert K. Greenleaf, author of the classic Servant-Leadership, was director of management research at AT&T. He held a joint appointment as a visiting lecturer at the MIT Sloan School of Management and at the Harvard Business School. He died in 1990. Editor Larry C. Spears has been CEO of The Greenleaf Center for Servant-Leadership since 1990. He is the editor and co-editor of several books, including Insights on Leadership and Seeker and Servant."