As many as one in ten African American students has an incarcerated parent. One in four has a parent who is or has been incarcerated. The discriminatory incarceration of African American parents is an important cause of their children’s lowered performance, especially in schools where the trauma of parental incarceration is concentrated. In this report, we review studies from many disciplines showing that parental incarceration leads to an array of cognitive and noncognitive outcomes known to affect children’s performance in school, and we conclude that our criminal justice system makes an important contribution to the racial achievement gap.