“As the Studio Museum prepares to break ground [on 125th Street] next year, coinciding with its 50th anniversary, [Thelma] Golden, 52, is overseeing the institution at a turning point in its history. … Ms. Golden’s name, meanwhile, keeps coming up for top posts, like those at the Brooklyn Museum and the Metropolitan Museum of Art. At the same time, Ms. Golden must defend the Studio Museum’s importance in an age when the work of African-American artists is increasingly making its way into mainstream institutions.”