John Singer Sargent
1898, oil on canvas
Asher Wertheimer (1844-1918) was a successful art dealer who became wealthy specializing in French art & objects. Being a prominent 'Bond Street' personage, the Wertheimers were at times subject to the prevalent anti-Jewish feelings of that era. Sargent seems to have been untouched by the various ethnic attitudes of his age, and counted several other Jewish families among his patrons and friends. His affinity for the Wertheimers was such that he painted the family and its members some ten times, and joked of being in a state of "chronic Wertheimerism."
Also see "Daughters of Asher & Mrs. Wertheimer" here
Further info on this is in the Thomas Craven essay here.
This picture is part of the collection of the Tate Gallery