Abstract: This study examines leadership style on employee performance in the Public Sector of Ghana. The research used mixed method approach with descriptive linear regression method to determine the effect of leadership styles on employee performance. The full range leadership styles of transformational, transactional and laissez faire were considered with employee performance of In-Role Performance (IRP) and Organizational Citizenship Behavior (OCB).The population of the study is comprised of all the 921 staffs of the Ghana Atomic Energy Commission (GAEC). Simple random sampling as well as purposive and convenience sampling techniques were used in this research. Three questionnaires were used to collect data on leadership style and employee performance both quantitatively and qualitatively. SPSS software was used to calculate simple linear regressions to test the hypothesis. Themes were also developed from the interview transcriptions. The results from both analysis show that all the leadership styles do not have any effect on employee performance. However, the leaders were found to be exhibiting a mixture of transformational and transactional leadership attributes.