Robert K. Greenleaf (1904 - 1990) was director of management research at AT&T. He held a joint appointment as visiting lecturer of the MIT Sloan School of Management and at the Harvard Business School. As a lifelong student of organization, he distilled his observations in a series of essays, books, and videotapes on the theme of The Servant as Leader, to stimulate thought and action for building a better, more caring society. He is the author of the bestselling classic Servant-Leadership , as well as the newly published The Power of Servant-Leadership.