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Boards of directors are governing bodies that reside at the apex of the modern corporation. Boards monitor the behavior of firm management, provide managers access to knowledge, expertise, and external networks, and serve as advisors and sounding boards for the CEO. Board attributes such as board size and independence, director demographics, and firm ownership have all been studied as antecedents of effective board functioning and, ultimately, firm performance. Steady progress has been made toward understanding how boards influence firm outcomes, but several key questions about board leadership structure remain unresolved. Research on board leadership structure encompasses the study of board chairs, lead independent directors, and board committees. Board chair research indicates that when held by competent individuals, this key leadership position has the potential to contribute to efficient board functioning and firm performance. Researchers have found conflicting evidence regarding CEO duality, the practice of the CEO also serving as the board chair. The effect of this phenomenon—once ubiquitous among U.S. boards—ranges widely based on circumstances such as board independence, CEO power, and/or environmental conditions. Progressively, however, potential negative consequences of CEO duality proposed by agency theory appear to be counterbalanced by other governance mechanisms and regulatory changes. A popular mechanism for a compromise between the benefits of CEO duality and independent monitoring is to establish the role of a lead independent director. Although research on this role is in its early stage, results suggest that when implemented properly, the lead independent director can aid board monitoring without adding confusion to a unified chain of command. Board oversight committees, another key board leadership mechanism, improve directors’ access to information, enhance decision-making quality by allowing directors to focus on specialized topics outside of board meetings, and increase the speed of response to critical matters. Future research on the governance roles of boards, leadership configurations, and board committees is likely to explore theories beyond agency and resource dependence, as well as rely less on collecting archival data and more on finding creative ways to access rarely examined board interactions, such as board and committee meetings and executive sessions.

In 1975, the phrase “vertical dyad linkage” (VDL) was introduced to begin examining the quality of the roles between the leaders and direct reports, and it was soon discovered that the linkages ranged between high quality and low quality. That linkage progressed into “leader–member exchange” (LMX) in 1982. In essence, research reached a point where it found a continuum of the quality of the relationship between the two members. High-quality relationships put the employees into the leader’s “ingroup,” while low-quality relationships left employees on the outside looking in. It followed that those in the ingroup would have some say in the decision-making, would have easier access to the leader, and would garner more respect and “liking.” Researchers have used the LMX-7 to examine how the quality of superior/subordinate relationships affects individual, interpersonal, and organization factors like job satisfaction, communication motives, and organizational identification (as did the original LMX scale). Although the LMX-7 remains one of the most prominent psychometric measures of LMX, researchers still debate whether the construct should be considered unidimensional or multidimensional. While the intricacies of LMX-7 versus LMX have been argued, and with teams becoming more of an organizational resource, team–member exchange (TMX) was found to be a supported extension of LMX. While at this point TMX is lacking in the volume and pace of research, due to the difficulties of measurement among a group of people who might have a variety of leaders during the process, the existing research has produced some results that are extremely relevant, now and in the future. Examples of what has been found when the team exchange relationship is high include reduced stress, increased psychological empowerment, increased creativity, increased team performance, increased individual performance, increased organizational citizenship behaviors, increased organizational commitment, and increased job satisfaction, just to name a few. In sum, the investigation into LMX provides a history of the field of LMX and its many iterations and the role it plays in leadership studies. This research includes LMX antecedents, consequences, moderators, mediators, and outcomes, as any field in which over 4,500 papers have been published needs an effective way to highlight the progress and pathways.