The purpose of this study is to evaluate how the five variables that measure servant leadership (Altruistic Calling, Emotional Healing, Persuasive Mapping, Organizational Stewardship, and Team Learning) impact on teachers' perception of principal Wisdom. Participants were from fifteen moderate-need elementary schools located in southern New York State counties. One hundred and sixty-two teachers responded to a 36 item survey instrument. A structural equation model was used to evaluate which of the variables influenced wisdom. It was found that Altruistic Calling served as a mediator of Team Learning and Emotional Healing. Wisdom is predicted by Altruistic Calling (ß = 0.331), Persuasive Mapping (ß =0.195), and Organizational Stewardship (ß = 0.424). The three variables accounted for 81.4% of teachers' perception of principal wisdom. It is recommended that organizations that are interested in developing principal wisdom invest their developmental efforts into Altruistic Calling and Organizational Stewardship.