 Later, in 1876, the Seligmans joined forces with the Vanderbilt family to create public utilities in New York.The eight Seligman brothers produced 36 sons, but only Isaac Newton Seligman, Joseph's second son, assumed a leadership, becoming head of the firm in 1894.In the 19th century, the U.S. partnership of J.& W. Seligman & Co. Inc. had affiliates in Paris, Frankfurt and elsewhere.