Gimpel was one of three sons of a French father, the art dealer René Gimpel, and an English mother, Florence, the youngest sister of Lord Duveen.
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Among his American clients in the years preceding World War I was Henry Clay Frick, for whom Allom furnished houses in cooperation with Sir Joseph Duveen, the eminent paintings dealer.
Frank Porter Wood was a client of Sir Joseph Duveen; and like most of Duveen clients Frank Porter Wood donated his paintings to public institutions, including his residence that was distinguished by the Beaux-Arts architecture, influenced and built by William Adams Delano and which now houses the Crescent School.
Bastianini's tin-glazed terracotta Portrait of a Lady in the Della Robbia technique, authenticated by Bernard Berenson as a "15th century Della Robbia bust of Marietta Strozzi" found its way through Joseph Duveen to the Isabella Stewart Gardner Museum, Boston.