Ronald William Clark (2 November 1916-1987) was a British author of biography, fiction and non-fiction.

Born in London, Clark was educated King's College School. In 1933, he embarked on a career as a journalist, and served as a war correspondent during the Second World War after being turned down for military service on medical grounds. As a war correspondent, Clark landed on Juno Beach with the Canadians on D-Day. He followed the war until the end, and remained in Germany to report on the major War Crimes trials.

After returning to Britain in 1948, Clark embarked on a career as an author. He wrote extensively on subjects ranging from mountain climbing (over a dozen titles), the atomic bomb, Balmoral Castle, and world explorers, as well as novels of alternate history. He also wrote a number of biographies of a diverse range of historical figures, including: Charles Darwin, Thomas Edison, Albert Einstein, Benjamin Franklin, Sigmund Freud, J.B.S. Haldane, V. I. Lenin, Bertrand Russell, and William F. Friedman.

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