Sir Karl Raimund Popper, CH, FRS, FBA (28 July 1902 – 17 September 1994) was an Austro-British philosopher and a professor at the London School of Economics. He is regarded as one of the greatest philosophers of science of the 20th century; he also wrote extensively on social and political philosophy.
Popper is known for his attempt to repudiate the classical observationalist / inductivist account of scientific method by advancing empirical falsification instead; for his opposition to the classical justificationist account of knowledge which he replaced with critical rationalism, "the first non justificational philosophy of criticism in the history of philosophy"; and for his vigorous defense of liberal democracy and the principles of social criticism that he came to believe made a flourishing "open society" possible.
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