From 1948 to mandatory retirement in 1976, Kindleberger taught international economics at MIT, which over that same time grew to become the leading economics department in the world. His original plan was to keep one foot in the world of policy, the better to push for Hansen’s postwar vision of economic development in the Global South. Security clearance trouble, however, put that plan on hold, and forced him instead to embrace a more purely scholarly career. Over time, the increasingly technical character of modern economics pushed him to the fringes of academia, where he reinvented himself as an economic historian.