Sarah Greenough, senior curator and head of the department of photographs, National Gallery of Art. Looking In: Robert Frank's The Americans, an exhibition organized by the National Gallery of Art, is the most comprehensive and in-depth exploration ever undertaken of the preeminent book of photographs published since World War II. In this Notable Lectures podcast, recorded on January 18, 2009, the opening day of the exhibition, Greenough discusses Frank's process in creating this powerful and provocative book as well as the publication's legacy 50 years later.