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:
So Beautiful or So What Many reviewers took note of the rather overt religious symbolism in Simon's lyrics; one Irish blogger facetiously called "So Beautiful or So What" the year's best Christian music album, while American evangelical journalist Cathleen Falsani said it was the most significant record of spiritually reflective music in recent years. Writing for "MSN Music", Robert Christgau found Simon's usual folk rock "graced with global colors that sound as natural" as his guitar and said his lyrics are imbued with gratitude for his wife's love and God, although he disagreed with Simon's view of God's benevolent nature. Some critics were less receptive.