In recent years, the composition of boards and, particularly, the inclusion of women on boards has attracted significant scholarly interest and public debate. In this article, I comprehensively review the academic literature on board gender composition. Using the systematic review method, I ask whether women directors really are different from men on boards, what factors shape board gender composition, how board gender composition affects organizational outcomes, and finally, why board gender quotas and other forms of regulation are introduced and what outcomes can be expected. Based on my findings, I develop a conceptual framework that clarifies the causal processes underlying both women's access to boards and the effects of women's presence on boards. Finally, I offer a research agenda designed to enrich our understanding of board gender composition.
