It is a highly unusual breach of protocol for a former college president to openly undercut his successors and denounce his longtime academic home. And observers note the irony of Summers lecturing university leaders on public diplomacy while he was forced to step down as president after alienating Black scholars and suggesting women are innately inferior at science and math. At a moment of crisis for Harvard and higher education generally, he has emerged as a leading critic of both, privately offering his colleagues unsolicited advice and publicly blasting those who disregard it. Nearly two decades after he was ousted...