Given their significant regional economic benefits, science and technology parks (STPs) have attracted continuous academic attention. To understand the predictors of performance of STPs, this study focuses on the critical impacts of leaders and develops a leadership competency model specialized for public STP leaders. The competency model identifies the qualities and conditions of an effective leader of public STPs, emphasizing management skills, bottom-up approach, and boundary spanning skills. To provide empirical support, this study adopts the case study approach and performs a behavior event interview with one of the most successful leaders of public STPs in Korea.