 He then met Arthur Pap, “who had come to Vienna to lecture on analytic philosophy and who hoped, perhaps somewhat unrealistically, that he would be able to revive what was left from the great years of the Vienna Circle and the analytic tradition there” (“Herbert Feigl: A Biographical Sketch”, p. 3). Feyerabend became Pap’s assistant. Pap arranged for him to meet Herbert Feigl in Vienna in 1954, and together they studied Feigl’s papers. Feigl had been a member of the Vienna Circle until his emigration to the USA in 1930, but he had never given up the “realist” view that there is a knowable external world. He convinced Feyerabend that the positivism of Kraft and Pap had not solved the traditional problems of philosophy. His paper “Existential Hypotheses” (1950), together with Kraft’s contributions and certain ideas Popper had put forward at Alpbach in 1948 and 1949, greatly diminished Feyerabend’s doubts about realism (ibid., p. 4). Here is how Feyerabend recounts Feigl’s influence: