With this appreciation of three very different black writers, novelist Darryl Pinckney reminds us that marginal or neglected literary figures have a lot to tell us about the history of a people who are always "outsiders." Born in Jamaica in 1883, J. A. Rogers was an early member of the Harlem Renaissance -- a newspaper columnist, historian of Negro achievement, polemicist against white supremacy, and amateur sociologist of interracial sex as evidenced...