Chapter 4 opens up the black box of the firm to assess the effects of leadership on reform outcomes in China Infrastructure (CI) (pseudonym), a central SOE in the construction industry. The chapter features paired comparisons of the consecutive tenures of chairmen in CI and process tracing of original data gathered during fifteen months of fieldwork inside the company, primarily in its Beijing headquarters, between January 2014 and June 2016, with follow-up visits in June 2018, December 2019, and December 2023. It presents evidence that the chairman’s leadership generated variation in the degree to which market expansion was decentralized and in the balance of influence among intra-firm actors. The chapter also evaluates and rules out alternative explanations: guanxi with and intervention by higher-level officials, shifts in policy by administrative superiors, and changes in industry competition in domestic and international markets.