Not your average Jo
She appears in one of the most beloved paintings in Washington’s National Gallery of Art — “Symphony in White, No. 1: The White Girl” (1862) — but few people know her name. No longer. Joanna Hiffernan is now at the center of The Woman in White, an exhibition at the NGA that explores the close working relationship between James McNeill Whistler and his Irish model and mistress that produced some of the most beautiful and enigmatic paintings of the 1860s. “The White Girl” is a haunting full-length portrait of a young woman, with large blue eyes and Titian-red hair, in a white linen dress. She stands on a rug made from the pelt of a wolf (or is it a bear?