In 1992 the Robert Lehman Lectures on Contemporary Art series was founded with a generous grant from the Robert Lehman Foundation, Inc., to foster discussion of Dia's exhibitions. Lecturers from a variety of disciplines analyze the artworks within the context of the artist's oeuvre and in relation to contemporary cultural issues.
Thirty years after his untimely death, Robert Smithson (1938-1973) remains one of the most influential artists of his generation. His complex ideas took root in many forms, including drawings, projects, proposals, sculpture, earthworks, films, and critical writings. Although made in a brief span from the mid-sixties to the early seventies, Smithson's provocative works redefined the language of sculpture.