Private schools provide an alternative to public education in the United States. Parents select private schooling for a variety of reasons. One of those reasons is to provide a quality educational opportunity for their children. Research indicates that one key indicator for school effectiveness is school leadership (David, Darling-Hammond, LaPointe, & Meyerson, 2005). In order to maintain and improve the health of private schools, leaders must possess or be trained in skills that will meet the unique needs and challenges of today's private, non-federally funded, educational institution. The skills necessary to sustain tomorrow's educational leaders will require a diverse expertise and new development of skills to meet the demands of the rapidly changing educational community (Hitt, 2000). Some of the changes that have created the demand for this new set of skills are globalization, the rapid pace of technological advances, and the economic downturn in the global economy. Through the use of the Delphi Technique, this study identifies a set of 28 skills that 31 private K-12 school administrators reported as necessary for today's success and tomorrow's sustainability for the leader of the private school. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]