Manuel F. Bagues and Natalia Zinovyeva at VoxEU: Does gender matter for academic promotion? Evidence from a randomised natural experiment. Here's the abstract:
Several countries have recently introduced gender quotas in hiring and promotion committees at universities. Evidence from promotions in the Spanish university system suggests that quotas are only effective at increasing the number of successful female applicants in promotions to top positions. This column argues that, given that sitting on committees reduces the available time for research, gender quotas should be implemented only for more senior academic positions.