The present study was designed to produce novel theoretical insight regarding how leader humility and team member characteristics foster the conditions that promote shared leadership and when shared leadership relates to team effectiveness. Drawing on social information processing theory and adaptive leadership theory, we propose that leader humility facilitates shared leadership by promoting leadership-claiming and leadership-granting interactions among team members. We also apply dominance complementary theory to propose that team proactive personality strengthens the impact of leader humility on shared leadership. Finally, we predict that shared leadership will be most strongly related to team performance when team members have high levels of task-related competence. Using a sample composed of 62 Taiwanese professional work teams, we find support for our proposed hypothesized model. The theoretical and practical implications of these results for team leadership, humility, team composition, and shared leadership are discussed. (PsycINFO Database Record

Although the effectiveness of leader humility has been well documented, our understanding of how leader humility influences followers psychologically is limited. Surpassing a mere leader‐centric understanding of the leader influence process by more fully understanding how leadership behavior shapes followers psychologically has been identified as a critical need by leadership scholars. Drawing on self‐expansion theory, we argue that leader humility triggers followers’ self‐expansion and that this psychological change enhances followers’ self‐efficacy, which in turn contributes to followers’ task performance. We also argue that the relationship between leader humility and followers’ self‐expansion is strengthened when leaders and followers are similar in age and gender. Using a time‐lagged research design with responses from 256 leader–follower dyads, we found support for our proposed model. We discuss the theoretical implications for our findings and suggest areas for future research.

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Shared leadership in teams is believed to be beneficial for team effectiveness. Yet recent empirical evidence shows that it may not always bring positive effects. On the one hand, the team leadership literature suggests that shared leadership allows for frequent interactions among members, improving intrateam harmony and reducing conflicts. On the other hand, the team power literature suggests that frequent influence interactions among multiple leaders can form an arena in which members fight over their power turfs, thereby triggering conflict. Drawing on dominance complementarity theory, we suggest that team power base diversity-the variety in power bases among team members from which they derive their informal influence-is an important contingency that moderates the impact of shared leadership on relationship conflict to influence team performance. In a sample of 70 project-based teams, we find support for the proposition that at high levels of team power base diversity, shared leadership has a positive downstream effect on team performance through reduced team relationship conflict. We discuss the contributions to knowledge about shared leadership and highlight practical implications for temporary teams with no formally designated leaders.