STEM disciplines are believed to be founded on the idea of meritocracy; recognition earned by the value of the data, which is objective. Such disciplinary cultures resist concerns about implicit or structural biases, and yet, year after year, scientists observe persistent gender and racial inequalities in their labs, departments, and programs. In Equity in Science, Julie Posselt makes the case that understanding how field-specific cultures develop is a crucial step for bringing about real change. She does this by examining existing equity, diversity, and inclusion efforts across astronomy, physics, chemistry, geology, and psychology. These ethnographic case studies reveal the subtle ways that exclusion and power operate in scientific organizations and, sometimes, within change efforts themselves.