In an era when American artists didn't count and women were expected to stay home, Edith Gregor Halpert burst onto the fledgling New York gallery scene, defying all cultural and societal rules. In 1926, Halpert, just twenty-six years old, opened one of the first art galleries in Greenwich Village and set about turning the art world upside down. Her Downtown Gallery, which she ran for forty-four years, laid the groundwork for the art market's modern...