As Greece’s debts were no longer market loans but debts owed to the troika, his tactic was to mobilize the pragmatism of the market against the financial orthodoxy of the eurozone. He courted the support of the City of London, the Financial Times and authorities like Larry Summers, as well as a coterie of American economic advisers that included both confirmed leftists such as Jamie K. Galbraith and Jeffrey Sachs, onetime exponent of “shock therapy” for the post-Communist world.