Post-World War II, Luther was trustee of Merck Finck & Co., a private bank in Munich, in 1948/49. He also served as a member of the supervisory board of the "Bayerischen Hypotheken und Wechselbank". In 1952, the Munich "Hochschule für politische Wissenschaften" awarded him an honorary professorship. In 1952–1955, Luther was the chairman of the committee of experts on the territorial restructuring of the Federal Republic of Germany ("Sachverständigen-Ausschuß für die Neugliederung des Bundesgebiets"). In 1958, he became president of the reestablished "Verein für das Deutschtum im Ausland".