[6][7] Hugo Reiss married, at The Grand Hotel in Yokohama, Japan, on 16 October 1911, Marie Ignatius Murphy[8][9] (1891-1965), an Irish Roman Catholic native of San Francisco, California; she was a daughter of James.
[14] On 1 June 1939, at Villa Monte Cristo, Vaucresson, France, Reiss married Fritz Mannheimer (1890–1939), a German Jewish banker and art collector.
The director of Mendelssohn & Co. in Amsterdam, a branch of a Berlin bank on Jagerstrasse 51, known for floating multimillion-dollar loans to various European governments, including that of Germany and Russia, he died eight weeks after the wedding, reportedly of a heart attack, on 9 August 1939.
[18] In 1950, he inherited an ownership stake in the Engelhard Minerals and Chemicals Corporation, the world's largest refiner and fabricator of platinum, gold and silver and the producer of the first catalytic converter.
[21] They also owned a country house in South Africa, and residences in London, Paris, Maine, Nantucket, New York City, and Quebec's Gaspé Peninsula.