Adrian Clark has published extensively on various British artists and is the author of a biography of John Rothenstein, director (1938–64) of the Tate Gallery, and Cooper’s bête noire. He also co-wrote, with Jeremy Dronfield, a biography of the collector and financier of Horizon magazine, Peter Watson.
 
Richard Calvocoressi is a senior curator at Gagosian in London. He was previously director of the Henry Moore Foundation and the Scottish National Gallery of Modern Art, where he acquired masterpieces from the collection of Cooper’s rival, Sir Roland Penrose. He has published on numerous artists, including Oskar Kokoschka, Paul Klee, Lee Miller, Francis Bacon, Lucian Freud, Georg Baselitz, and Anselm Kiefer.