Sir Karl Popper was one of the foremost philosophers of the Twentieth century. Born in Vienna in 1902, Popper grew up in a city witnessing great intellectual ferment. His relationship with the philosophers and scientists led to his first book, The Logic of Scientific Discovery, published in 1934. On its publication in English in 1959 it was described by The New Scientist as ‘one of the most important documents of the twentieth century’. On the eve of World War Two Popper was forced to flee to New Zealand, where he took up a teaching post at Canterbury University College at Christchurch. It was there, reflecting on the tyranny sweeping through Eastern Europe, that he wrote The Open Society and Its Enemies, published in 1945. In 1946 Popper moved to the London School of Economics, where he taught until his retirement in 1969. This period saw the publication of The Poverty of Historicism, described by the Sunday Times as ‘probably the only book which will outlive this century’. He was knighted in 1965 and appointed Companion of Honour in 1982. He died in 1994.