Career
Blumenthal was president of the Mount Sinai Hospital, New York, where he donated $2mil and where the Blumenthal auditorium is named after him. He was a trustee of the Metropolitan Museum of Art for many years as well as president of the American Hospital of Paris. He served as the seventh president of the Metropolitan Museum of Art from 1934 until his death in 1941, where he gave $1mil and to which he bequeathed the Patio from the Castle of Velez Blanco, a colonnaded Spanish Renaissance patio.
He retired from Lazard in 1901, giving up his seat on the stock exchange, and returned as a partner in 1906.
He returned to the stock exchange in 1916, purchasing a seat for $63,000. With J. P. Morgan the elder, he was one of five bankers who saved Grover Cleveland from giving up specie payments in 1896, with their $65,000,000 gold loans.
After the death of Florence Blumenthal, George Blumenthal married Mistress Mary (Marion) Clews, the former Mission Mary Ann Payne of New York, and widow of James Clews, banker — in December 1935 at age 77.
The two later endowed the George and Marion Blumenthal Research Scholarships awarded annually for demonstrated merit in community arts leadership by the Roski School of Fine Arts at the University of Southern California.