Employee turnover is a challenge for all organizations, including higher education. Public universities are losing staff members who are critical to the successful operation of these universities. Past research has shown that leadership style is a key factor that affects voluntary employee turnover. The purpose of this correlational study is to examine leadership effectiveness, leadership adaptability, and employee turnover intentions at a public university in Arizona. The Situational Leadership® model was employed as the framework for successful leadership and formed the basis for the survey questions. The study found a significant relationship between employees' voluntary turnover intentions and their supervisors' leadership effectiveness. This result suggests that as leadership effectiveness increases, employee turnover intentions decrease. The study found no relationship between employees' voluntary turnover intentions and their supervisors' leadership adaptability, or ability to use multiple leadership styles. Several recommendations were made for future research.