There are competing theoretical rationales and mechanisms used to explain the relation between leadership behaviors (e.g., consideration, initiating structure, contingent rewards, and transformational leadership) and follower performance (e.g., task performance and organizational citizenship behaviors). We conducted two studies to critically examine and clarify the leadership behaviors-follower performance relation by pitting the various theoretical rationales and mechanisms against each other. We first engaged in deductive (Study 1) and then inductive (Study 2) theorizing and relied upon 35 meta-analyses involving 3327 primary-level studies and 930 349 observations as input for meta-analytic structural equation modeling. Results of our dual deductive-inductive approach revealed an unexpected yet surprisingly consistent explanation for why leadership behaviors affect follower performance. Specifically, leader-member exchange is a mediating mechanism that was empirically determined to be involved in the largest indirect relations between the four major leadership behaviors and follower performance. This result represents a departure from current conceptualizations and points to a common underlying mechanism that parsimoniously explains how leadership behaviors relate to follower performance. Also, results lead to a shift in terms of recommendations for what leaders should focus on to bring about improved follower performance.Why do positive leadership behaviors improve various types of follower performance? This question is critically important for theoretical progression in the leadership domain because if we do not understand why these specific relations occur, we do not have a solid theory (Bacharach, 1989;Dubin, 1978;Sutton & Staw, 1995;Whetten, 1989). Additionally, if we do not clearly understand why leadership behaviors-follower performance relations occur, we will be limited in our ability to provide accurate and actionable recommendations for leaders that will result in the most favorable performance outcomes.While the question above is critically important for theoretical and practical reasons, results to date have led to multiple answers across the various leadership behaviors-follower performance relations. For example, consider one of the most well-researched leadership behavior-follower performance relation: transformational leadership and task performance. An examination of the literature reveals that there are at least eight empirically supported mediators explaining this relation, including self-congruence, empowerment, positive effect, trust, person/job fit, core job characteristics, leader-member exchange (LMX), and work engagement (Aryee, . Similar observations can be made for other often-researched leadership behaviors. For consideration, initiating structure, contingent rewards, and transformational leadership (i.e., the four most frequently studied leadership behaviors), the presence of multiple mediating mechanismsoftentimes more than 10serving as explanations for their relations with follow...