Since John Roberts is well known for intense, extensive preparation for his legal assignments, I do not doubt that before he wrote the amicus brief in the Freeman case, he knew a lot about Kenneth Clark, and why Clark's research on the effects on black children of segregation figured significantly in an historic footnote in the Supreme Court's decision in Brownv. Board of Education.
But Roberts, in 1991 and 1992, helped to effectively bury Brownv. Board of Education, with regard to segregated public schools. Nonetheless, Kenneth Clark was an American hero, and he must not be forgotten.