How much does the effect of industrial policy depend on the capacity of the bureaucrats implementing it? We exploit the rotation schedule of managers of South Korea’s export promotion offices in 87 countries between 1965 and 2000 to show that a one standard deviation increase in bureaucrat ability boosts exports by 37%, while the policy increases exports by 38% on average. Together, this implies the export promotion policy has no effect when implemented by a bureaucrat one standard deviation below average. Under higher-ability bureaucrats, South Korean exports respond more strongly to a country’s import demand, suggesting a more effective transmission of market information. We find that performance in the first appointment predicts whether a bureaucrat sees subsequent appointments, highlighting performance-based screening of bureaucrats as a mechanism that increases the policy’s effect.