Died: September 30, 1917
Married: Guta Loeb
Children: three daughters and four sons, the eldest son being Charles David Seligman
He graduated from Columbia College in 1876 where he was a member of the crew that won the university eight-oar college race in 1874, beating Yale, Harvard, and nine other schools.
In 1878, after a two-year apprenticeship in the firm of Seligman & Hellman in New Orleans, he joined the New York branch, of which he became head in 1885 on the death of his father.
He was connected with almost all the important social reform committees in New York. He was a trustee of nineteen important commercial, financial, and other institutions and societies, including the Munich Life Assurance Company, St. John's Guild, and the McKinley Memorial Association. He was a member of the Committee of Seventy, of Fifteen, and of Nine, each of which attempted at various times to reform municipal government in New York; of the last-named body he was chairman. He was a trustee of Temple Emanu-El and of the Hebrew Orphan Asylum, as well as of the United Hebrew Charities, and also a member of the Ethical Culture Society.
He was married to Guta Loeb (1865–1956), daughter of banker Solomon Loeb.
He died in 1917 after falling from his horse while riding to work in New York City from his summer home in Irvington, NY, a ride of about 25 miles.. His estate, estimated between $15 and $20 million, went to his son and widow. He made charitable gifts of $100,000.
Source: Wikipedia: Isaac Newton Seligman