The term “servant leadership” was introduced by Greenleaf in his landmark essay "The Servant as Leader," published in 1970. His work is cited by some of the most prominent business writers and leaders in the world. The book details the sources of his thought, describes his friendships with dozens of well-known people, shows how he influenced business history, and lived his own life as a servant leader. He oversaw a novel program which taught executive decision making through great literature, established the first corporate assessment center using knowledge gleaned from the OSS’s approach to training civilian spies during World War II, and invited leading philosophers and theologians to have conversations with AT&T executives. In retirement, he developed the concept of servant leadership, the then-heretical notion that leaders lead best by serving their followers rather than “commanding” them.