 In this way McLennan acquired many business contacts throughout the United States, enhancing Marsh & McLennan's reputation in the postwar period.While McLennan was the chairman of the company, Marsh & McLennan expanded its business into the consulting industry in 1938.Over the course of his life, McLennan sat on the boards of the American Sugar Refining Company, the Evergreen Mines Company, Armour & Company, the First National Bank of Lake Forest, the Pennsylvania Railroad, the Peoples Gas, Light and Coke Company, the Continental Illinois National Bank and Trust Company, the Pullman Company, Pullman, Inc., the Chicago Corporation, and the Empire Securities Company.