 He is also past chairman of the Board of Governors of the United States Postal Service and a member of the Board of Trustees of the Ford Foundation.According to documents filed with the SEC, he is a director serving on the board of Corrections Corporation of America, the largest commercial vendor of federal detainment and prisoner transport in the United States.Since 2012, Marshall is also an independent director serving on the board of Genesco Inc., an international footwear and apparel retailer based in Nashville, Tennessee.