After the war, Brown took a position as bookkeeper and cashier with A. B. Meeker & Company, becoming a partner in 1871. He purchased a controlling interest in 1883, renaming the company Pickands, Brown & Company. The company rose to become one of the largest distributors of pig iron and coke in the nation through a partnership with the Illinois Steel Company. In 1890, he co-founded the Chicago Ship Building Company. He was elected president of the organization nine years later and would later serve as chairman of the board of directors. Brown was also president of the South Chicago Furnace Company, a manufacturer of pig iron.[1] Brown was a director of the Lackawanna Steel Company, American Ship Building Company, Detroit Ship Building Company, First National Bank of Chicago, the First Trust & Savings Bank of Chicago, Calumet Transit Company, and the Federal Furnace Company.[2]