In making sense of the desegregation trajectories that have developed since passage of the Civil Rights Act, the book makes highly creative use of social closure theory, applied alongside the shifting American political landscape. The book finds that racial and gender segregation has remained especially pronounced in higher paying industries and occupations (much as closure theory would predict). But the book also finds that organizations that rely on formal professional credentials exhibit a much more level playing field than do firms that rely on less formal markers of skill and expertise. This finding calls for important modifications in social closure theory, since it suggests that educational credentials can enable (and not merely block) access to job rewards among historically excluded groups. This is a vital and important finding. But in presenting these results, the book does not always show us why this pattern is the case. Did the class or racial advantages that white women enjoy give them easier access to credentialing institutions? Was the effect of meritocracy also apparent in industries that rely heavily personnel in STEM fields? Or are the leveling effects of educational credentials limited to professional contexts such as law, accounting, social work and teaching? Arguably, heavily feminized professions account for much of this meritocracy effect. My point is that the nature and sources of the meritocracy trend need more discussion than the authors provide.