Robert K. Greenleaf published two posthumous essay collections (available at Greenleaf.org). Today scores of colleges and universities include Servant Leadership in their curricula and hundreds of companies embrace Greenleaf's philosophy. As Greenleaf strived to serve through education, he became the leader of a movement. Bass, B. M., and Stogdill, R. M. (1990). "Bass & Stogdill's Handbook of Leadership: Theory, Research, and Managerial Applications" (3rd ed.). New York:Free Press. Frick, Don M. (2004)." Robert K. Greenleaf: A Life of Servant Leadership." San Francisco: Berrett-Koehler Publishers. Greenleaf, R.K. (2003). "The Servant-Leader Within: a Transformative Path" New York: Paulist Press. Greenleaf, R. K. (2002). "Servant Leadership:
Robert Collier (author) Robert Collier (author) Robert Collier (April 19, 1885 in St. Louis, Missouri – 1950) was an American author of self-help and New Thought metaphysical books in the 20th century. He was the nephew of Peter Fenelon Collier, founder of "Collier's Weekly". He was involved in writing, editing, and research for most of his life. His book "The Secret of the Ages" (1926) sold over 300,000 copies during his life. Collier wrote about the practical psychology of abundance, desire, faith, visualization, confident action, and personal development. Robert Collier Publications, Inc. still exists through the efforts of his widow, and now his