In Robert Sigmon's article published in the Winter 1980 Edition of the Synergist, Sigmon reviews Robert Greenleaf's Teacher as Servant. Greenleaf's book focuses on service and service-learning. Sigmon also includes direct quotes from Greenleaf when asking him why he wrote the book. Teacher as Servant is about students who live at Jefferson House and have a teacher named Mr. Billings, who encourages service-learning.