There is a massive gender imbalance in the sciences. In jobs and promotions, in publications, in grants received and in invited presentations, women are unacceptably underrepresented. Gender imbalance is only one axis of underrepresentation, the scientific careers of underrepresented minorities, especially women of color, are more severely harmed by this imbalance. Creating balanced science requires effort, diligence, and acknowledgement when the system is not working. As this week’s action we are preparing to hold individuals, scientific societies, conferences and institutions accountable.