Clement Greenberg was probably the single most influential art critic in the twentieth century. Although he is most closely associated with his support for Abstract Expressionism, and in particular Jackson Pollock, his views closely shaped the work of many other artists, including Helen Frankenthaler, Morris Louis, and Kenneth Noland. His attention to the formal properties of art - color, line, space and so forth - his rigorous approach to criticism, and his understanding of the development of modern art - although they have all been challenged - have influenced generations of critics and historian.