The Vienna Circle were a group of early 20th century philosophers associated with the Ernst Mach Society at the university of Vienna, which was chaired by Moritz Schlick. The most notable members were Rudolph Carnap, Freidrich Waismann and Kurt Goedel. The Vienna Circle's central belief was that experience can be reduced totally to logic. . The Vienna Circle influenced several later philosophers, including Alfred Ayer and Karl Popper
HistoryThe Vienna circle started a small philosophical society meeting on every Thursday evening from 1924 onwards. Many members were leading Austrian mathmaticians, scientists and philosophers. . Its rise in prestige started in 1929, when it started lecture series on mathematics and philosophy and published a great amount of material on the mathetmatical and logical basis of philosophy. It quickly gained an international profile, collaborating with the Berlin Society to produce an annual journal on philosophy and science. 
- The Scientific Conception of the World. The Vienna Circle in Sarkar, Sahotra, 1996, p. 337'
- http://plato.stanford.edu/entries/vienna-circle/#BasPerActOveDoc 2.2:Activities
- http://plato.stanford.edu/entries/vienna-circle/#BasPerActOveDoc 2.3: