The Austrian philosopher Sir Karl Raimund Popper (1902-1994) offered an original analysis of scientific research that he also applied to research in history and philosophy. Karl Popper was born in Vienna on July 28, 1902, the son of a barrister. He studied mathematics, physics, and philosophy at the University of Vienna. Though not a member of the Vienna Circle, he was in sympathy with some, if not all, of its aims. His first book The Logic of Scientific Discovery (1935) was published in a series sponsored by the Circle. In 1937 Popper accepted a post in New Zealand as senior lecturer in philosophy at Canterbury University College in Christchurch.

At the end of World War II, Popper was invited to the London School of Economics as a reader, and in 1949 he was made professor of logic and scientific method. Popper then made numerous visits to the United States as visiting professor and...