Alfred D. Chandler Jr. was an American historian and professor who studied business history and strategy. In his 1962 book "Strategy and Structure", Chandler analyzed 100 large U.S. firms and conducted in-depth case studies of DuPont, Sears, GM, and Standard Oil of New Jersey. He determined that a company's environment affects the type of strategy it selects, and the strategic plans in turn determine the type of organizational structure. Specifically, he found that companies in stable environments should adhere to set strategic plans and have mechanistic structures, while those in uncertain environments should diversify through flexible strategies and decentralized, organic structures.