This paper uses a unique historical episode to assess the long-run effects of management and technology transfer on firm performance. During the 1950s, as part of the Marshall Plan, the US administration sponsored management-training trips for European managers to US firms and granted state-of-the-art machines to European firms. I use newly-assembled data on the population of Italian firms eligible to participate in this program, tracked over a twenty-year period. By exploiting an unexpected cut in the US budget, I compare firms that eventually participated in the program with firms that were initially eligible to participate, but were excluded after the budget cut. I find that management transfer significantly increased Italian firms’ survivorship, sales, employment and productivity. These positive effects persisted for at least fifteen years after the program, a finding that can be explained by the increased investment rates, capital-to-labor ratio, more educated managers’ hires, and employees training expenditures in such firms. Companies that received new machines also improved their performance, but the effects were short-lived.