Clark made a series of six programmes for ITV. They were collectively titled "Pioneers of Modern Painting", directed by his son Colin. They were screened in November and December 1971, with a programme on each of Manet, Cezanne, Monet, Seurat, Rousseau, and Munch. Although they were shown on commercial television, there were no advertising breaks during each programme. With the aid of a grant from the National Endowment for the Humanities, the National Gallery of Art in Washington DC acquired copies of the series and distributed them to colleges and universities throughout the US.