“The search for the next director of the National Gallery of Art has revealed deep divisions within the federally funded institution, a palace of high art that is dogged by old-fashioned ideas about museum operations and staff claims of widespread mismanagement. … With [Rusty] Powell’s 26-year tenure coming to an end, the museum has the opportunity to revitalize its programs and modernize its operation, according to interviews with 22 current and former employees and industry experts.”