Rudolph J. Heinemann, also known as Rudolf J. Heinemann, (1901 – February 7, 1975) was a German-born American art dealer and collector of Old Masters. He was an advisor to Baron Hans Heinrich Thyssen-Bornemisza, who established a museum in Lugano, Switzerland with his help. Heinemann and later, his wife Lore, donated works of art to the Metropolitan Museum of Art, the Frick Collection, the National Gallery of Art and the Morgan Library & Museum. Source: Wikipedia (en)