Philip D. Block, the head of Inland Steel in Chicago, was a close friend of Albert Lasker dating from the 1920s. Leigh Block was a director of Inland Steel, who married her second husband Albert Lasker's daughter Mary. Mary Woodard Lasker carried on a correspondence with them from 1940 to 1965. Leigh Block was also the brother of Eleanor Saidenberg; she and her husband Daniel were Picasso's agents in the US from 1955 to his death in 1973. The Saidenbergs moved from Chicago to New York in 1943. The Blocks endowed the Museum of Art in their name at Northwestern University.
Inland Steel was part of the "Illinois Interlock," a group of companies whose directors all tend to be drawn from within the group, and use the same banking and law firms. 1994 directors of Inland included James W. Cozad, former treasurer of Philip Morris, also a director of Sears, Roebuck & Co. and Eli Lilly & Co.; Robert Darnall, Chairman, President and CEO of Inland Steel Company who joined it in 1962, and is a director of Cummins Engine Co. Inc. and Household International; James A. Henderson, President and COO of Cummins Engine Co.; Robert B. McKersie, who was on the faculty of the Graduate School of Business at the University of Chicago; Donald S. Perkins, a director of W. Clement Stone's Aon Corp. and of Cummins Engine; Raymond C. Tower, director of Household International and Morton International; and Arnold R. Weber, President of Northwestern University, also a director of Aon Corp., PepsiCo, and the Tribune Co.Inland Steel 1994 DEF 14A / Securities and Exchange Commission
Inland's manufacturing operations merged into ISPAT in 1998, and the rest was merged into Ryerson Tull in 1999.Inland - Ryerson merger 1998 / Securities and Exchange Commission