Sarah Greenough, curator and head of the department of photographs. National Gallery of Art The National Gallery of Art has presented memorable exhibitions of photographs through the years, ranging from monographic shows on the work of such well-known photographers as Ansel Adams and Robert Frank to historically based exhibitions such as Foto: Modernity in Central Europe, 1918-1945. The Gallery's deputy director Alan Shestack speaks with curator Sarah Greenough about the history of the photography collection and the gallery space devoted to the medium.