The purpose of this study was to identify the strategies used by elementary school principals, in highly effective schools, to foster teacher leadership. This study examined teacher leadership from both the principal and teacher perspective. Multiple case studies were conducted in the examination of three highly effective elementary schools. A qualitative inquiry method was used to examine the research questions related to the role of the principal. This research model allowed an opportunity to interview each principal and teacher in their own environment. Each interview was semi-structured and included a list of established questions that were asked in no pre-determined, allowing for open dialogue. This study found that the development of teacher leadership is carefully and thoughtfully designed in highly successful schools. In addition, the development of teacher leadership programs and opportunities and at the school district level were important in developing successful teacher leaders. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]