FTP, who was this philosopher whose chief contribution was his falsifiability principle which he first explained in The Logic of Scientific Discovery.
Although the Vienna Circle was responsible for publishing his first work, he rejected both their empiricism and method of using induction to judge scientific rules.  Later he became interested in the social sciences and began to attack fascism and Nazism in his The Poverty of Historicism.  Turning away from communism, he became an advocate of liberal capitalism with The Open Society and Its Enemies.  FTP, who was this philosopher whose chief contribution was his falsifiability principle which he first explained in The Logic of Scientific Discovery.
Although the Vienna Circle was responsible for publishing his first work, he rejected both their empiricism and method of using induction to judge scientific rules.  
Sir Karl {Popper}