Keynes moved to the United States in 1939. Shortly after the Second World War he started his life as an explorer of Africa and sub-equatorial islands of the Atlantic and Indian Oceans. He made several films, and wrote several articles for the National Geographic magazine. He was a member of the Roxburghe Club[1] and collected books principally on the great explorers of the 19th century, but also travel, natural history, including rare and first editions of works by his grandfather Charles Darwin, and modern literature. His collection of rare books and manuscripts was sold by Christie's in a series of four auctions in 2004.[2]
A biography of him was published in 2004 by his nephew, the historian Simon Keynes.