Sir Karl Raimund Popper, CH FRSFBA (28 July 1902 – 17 September 1994) was an Austro-Britishphilosopher and professor at the London School of Economics. He is generally 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 form of scientific method in favour of empirical falsification. He is also known 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". In political discourse, he is known for his vigorous defence of liberal democracy and the principles of social criticism that he came to believe made a flourishing "open society" possible.
Karl Popper was born in Vienna (then in Austria-Hungary) in 1902, to upper middle-class parents. All of Karl Popper's grandparents were Jewish, but the Popper family converted to Lutheranism before Karl was born. Karl's father Simon Siegmund Carl Popper was a lawyer from Bohemia, and mother Jenny Schiff was of Silesian and Hungarian descent. After establishing themselves in Vienna, the Poppers made a rapid social climb in Viennese society: Simon Siegmund Carl became a legal partner[clarification needed] of Vienna's liberal mayor Raimond Grübl and, after his death in 1898, took over the firm (Karl received his middle name from the mayor).
Helmut Heinrich Waldemar Schmidt (German pronunciation: [ˈhɛlmʊt ˈʃmɪt]; born 23 December 1918) is a German Social Democratic politician who served as Chancellor of West Germany from 1974 to 1982. Prior to becoming chancellor, he had served as Minister of Defence and Minister of Finance. He had also served briefly as Minister of Economics and as acting Foreign Minister. He is the oldest surviving German Chancellor and the last surviving person to have been solely Chancellor of West Germany (Helmut Kohl was Chancellor of both West Germany and reunified Germany). He is also the oldest living Federal German Minister, after the death of his Interior Minister Werner Maihofer.
Helmut Schmidt was born in Hamburg, as son of two teachers. He studied at Hamburg Lichtwark School, graduating in 1937. He was conscripted into military service and began serving with an anti-aircraft battery at Vegesack near Bremen during World War II. After brief service on the Eastern Front he returned to Germany in 1942 to work as a trainer and advisor at the Reichsluftfahrtministerium. Also in 1942, on 27 June, he married his childhood sweetheart Hannelore "Loki" Glaser (3 March 1919 – 21 October 2010), with whom he fathered two children: Helmut Walter (26 June 1944–February 1945, died of meningitis), and Susanne (b. 1947), who works in London for Bloomberg Television. Toward the end of the war, from December 1944 onwards, he served as an Oberleutnant in the artillery on the Western Front. He was captured by the British in April 1945 on Lüneburg Heath and was a prisoner of war until August. During his service in World War II Schmidt was awarded the Iron Cross.
Thomas Samuel Kuhn ( /ˈkuːn/; July 18, 1922 – June 17, 1996) was an American historian and philosopher of science whose controversial 1962 book The Structure of Scientific Revolutions was deeply influential in both academic and popular circles, introducing the term "paradigm shift," which has since become an English-language staple.
Kuhn has made several notable claims concerning the progress of scientific knowledge: that scientific fields undergo periodic "paradigm shifts" rather than solely progressing in a linear and continuous way; that these paradigm shifts open up new approaches to understanding that scientists would never have considered valid before; and that the notion of scientific truth, at any given moment, cannot be established solely by objective criteria but is defined by a consensus of a scientific community. Competing paradigms are frequently incommensurable; that is, they are competing accounts of reality which cannot be coherently reconciled. Thus, our comprehension of science can never rely on full "objectivity"; we must account for subjective perspectives as well.