After World War II, the Allies held Schleyer as a prisoner of war for three years because of his membership as an Untersturmführer in the SS. In his denazification proceeding, Schleyer falsely understated his rank so as to reduce his prospective punishment. He was repatriated in 1948. In 1949 he became secretary of the chamber of commerce of Baden-Baden. In 1951 Schleyer joined Daimler-Benz, and, with help from a mentor, Fritz Könecke, eventually became a member of the board of directors. At the end of the 1960s, he was almost appointed chairman of the board, but lost the position to Joachim Zahn. Successively, Schleyer became more involved in employers' associations, and was a leader in employer and industry associations. He was simultaneously president of the Confederation of German Employers' Associations (BDA) and the Federation of German Industries (BDI).