 In 1919, Leipziger moved to Mannheim to join the Ludwigshafen branch of the large steel firm "Wolf Netter & Jacobi", where he remained until 1931.He then moved to Bonn with his wife Erna, whom he had married in 1929, to head the firm "Magnesit GmbH", a manufacturer of refractories.In 1933 after being degraded by the Nazis to assistant, he resigned and the couple moved to Luxembourg, where Leipziger founded the "Société Anonyme des Minerais".