A lover of horses and a polo enthusiast, Robert Lehman played on a polo team with Averell Harriman, Jock Whitney and Tommy Hitchcock, Jr..
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The importance of his collection became such that in 1957, nearly three hundred works were used for a solo exhibit at the Louvre Museum's Musée de l'Orangerie in the Tuileries Gardens in Paris.
Robert Louis Stevenson | Robert De Niro | Robert E. Lee | Robert Mugabe | Robert Redford | Robert Burns | Robert Bosch GmbH | Robert | Robert A. Heinlein | Robert Schumann | Robert Browning | Robert Rauschenberg | Robert Plant | Robert Altman | Robert Mitchum | Robert Frost | Lehman Brothers | Robert Southey | Robert F. Kennedy | Robert Maxwell | Robert Graves | Robert E. Howard | Robert Fripp | Robert Fisk | Robert Rodriguez | Robert Motherwell | Robert Lowell | Robert Johnson | Robert Duvall | Robert Boyle |
A self-described "cabinetmaker who fashioned large pedestals for small statues", Sonnenberg represented such individuals as Samuel Goldwyn, Robert Lehman, William S. Paley and David O. Selznick.