The Etchings of John Sell Cotman by A.E. Popham, in The Print Collectors' Quarterly. Arthur Ewart Hugh Popham (1889-1970) was a scholar of Italian art and a Keeper of Prints and Drawings at the British Museum, 1912-54. In 1954 Popham retired and embarked on another career of cataloguing print collections for major auction houses and scholars. He succeeded Paul Oppé (1878-1957) as European adviser to the National Gallery of Canada.