The autonomous organization and implementation of the school-level curriculum has been expanded according to the policy of autonomy of the school-level curriculum. However, the level of such practices is minimal or passive. This study was started with a problem awareness that the cause of this problem was the lack of expertise in the curriculum of teachers. Therefore, it was attempted to explore what experiences in teaching profession are necessary for teachers to grow into experts in school curriculum management in school. To this end, a life history research was conducted for the principal, who is recognized as expert in the management of school curriculum, on what he experienced in the teaching profession in the process of growing up as a curriculum leader. As a result, the contents experienced to form curriculum leadership in teaching are as follows. First, the training of counselor qualifications, experience as a counselor and teacher learning community, which became the basis for deducational literacy and educational philosophy. Second, practical experience in curriculum organization and development, which was able to accumulate practical knowledge and skills in the school-level curriculum. Third, there was a learning experience in graduate school that laid the academic foundation for the curriculum. In addition, it was found that there existed a contextual context in which the research participants could grow into the curriculum leaders. At that time, it was found that the atmosphere of the school and the educational community that recognized the teacher s expertise, the peer teachers who had improved expertise, numerous problems and conflicts, and the demands of the educational community existed.