Born on 15 August 1863 in
Krotoszyn, Katzenellenbogen came from an influential German Jewish family He was married to Cornelia Josephine (Nelly) née Doctor. Since 1912 the couple lived in
Königstein im Taunus in the "Oelmühlweg", where Albert Ullmann and
Oskar Kohnstamm also lived as neighbors under the same address. A lawyer by training, he was admitted to the bar in Frankfurt am Main in October 1891, and in July 1912 he was appointed a judicial councilor. Katzenellenbogen served on the executive boards of banks, textile companies and chemical corporations in various German cities. He was chairman of the board of
Mitteldeutsche Creditbank (Commerz- und Privat-Bank in Frankfurt), among others. In 1895, he became the bank's general counsel, in 1897 a member of the board of directors, and in 1903 a member of the board of management. After
Commerzbank was founded, Katzenellenbogen was a member of its Board of Managing Directors from 1929 to 1930 and then of its supervisory board until 1937. One year before the bank was
Aryanized, almost two thirds (64.5%) of Frankfurt bank mandates were approved by Jewish members of the supervisory board in which Katzenellenbogen was prominent. == Nazi persecution ==