Ronald Clark was born in London in 1916 and educated at King's College School. In 1933 he chose journalism as a career; during the Second World War, after being turned down for military duty on medical grounds, he served as a war correspondent. During this time Clark landed on Juno Beach with the Canadians on D-Day and followed the war until its end, then remained in Germany to report on the major War Crimes trials.

Clark returned to Britain in 1948 and wrote extensively on subjects ranging from mountain climbing to the atomic bomb, Balmoral Castle to world explorers. He also wrote a number of biographies on a myriad of figures, such as Charles Darwin, Thomas Edison, Albert Einstein, Benjamin Franklin, Sigmund Freud, and Bertrand Russell. Clark died in 1987.