Sheryl Sandberg’s encomium to her mentor, Lawrence Summers, could hardly have been more effusive. Summers has found himself in perhaps the biggest mess of his life – much of it of his own making. Jonathan Parker, an economist at the Massachusetts Institute of Technology (MIT), said Summers’ “creepy abuse of his professional power” was “infuriating”. [ Larry Summers, former US Treasury secretary, slammed Trump in Epstein emailsOpens in new window ]Still, few would question his brilliance as an economist. After his stint at the World Bank, he joined the government, working as treasury secretary Robert Rubin’s deputy in the Clinton administration.