Catalogue of the exhibition at the Kenwood House of Hampstead, London, Published by the Greater London Council (GLC), 1980
A French Landscape painter in 17th century Rome and his influence on British art.
“The brother-in-law of the great classical painter Nicholas Poussin, he was with Claude Lorrain the other member of that triumvirat of Frenchmen who dominated landscape painting in the seventeenth century Rome.
While one cannot pretend that he is of quite the same stature as the other two, nevertheless for England in the eighteenth century he was equally important: there were far more “Gaspars” than “Claudes” in English collections; his influence upon native painters was perhaps the greater, and when the merits of “classical landscape” were extolled, it was “Gaspar” as much as Claude that English cognoscenti had in mind.” (extract from the preface of the exhibition catalogue by Fredk W. Weyer, president of the GLC Arts Committee)