About Kenneth Clark (from Wikipedia):
Kenneth Mackenzie Clark, (13 July 1903 – 21 May 1983) was a British art historian, museum director, and broadcaster. After running two important art galleries in the 1930s and 1940s, he came to wider public notice on television, presenting a succession of programmes on the arts during the 1950s and 1960s, culminating in the Civilisation series in 1969.
In 1929, as a result of his work with Berenson, Clark was asked to catalogue the extensive collection of Leonardo da Vinci drawings at Windsor Castle. That year he was the joint organiser of an exhibition of Italian painting which opened at the Royal Academy on 1 January 1930. He and his co-organiser Lord Balniel secured masterpieces never seen before outside Italy, many of them from private collections. The exhibition covered Italian art “from Cimabue to Segantini” – from the mid-thirteenth to the late-nineteenth century.
Among his books is “the best introduction to the art of Leonardo da Vinci ever written”. Piper singles out, in addition to the Leonardo monograph, Clark’s Piero della Francesca (1951), The Nude (1956, based on his Mellon lectures in Washington in 1953), and Rembrandt and the Italian Renaissance (1966 from his Wrightsman lectures in New York). The critic Jackie Wullschlager wrote in 2014 that it was as a writer rather than a collector that Clark excelled: “unrivalled since Ruskin for lucidity, erudition, moral conviction”. James Hall, in The Guardian, expressed a similar view, calling Clark “the most seductive writer on art since Ruskin and Pater … Today, when most art historians write as joylessly as lawyers and accountants, such verve is sorely needed.”