To better understand the links between gender diversity and board dynamics, 45 male chairs of large Australian Securities Exchange (ASX) firms were interviewed to identify the impacts of the appointment of women on board functioning. Chairs held very positive perceptions about the influence of women board members, including improved dynamics around reflexivity, communication and debate which assisted chairs to promote a sense of shared group membership and cohesion. Every chair consciously worked to ensure that board member gender was not made a salient attribute or social category. Irrespective of gender, chairs encouraged board members to judge themselves as fulfilling specific components of the board skills matrix, while also identifying as a social category of highly qualified professionals rather than as unique individuals or factions categorised by gender difference or business track records. A preliminary social-psychological framework is proposed to guide future research and to promote improved boardroom practices. JEL classification: D23, D74, G41