Philosophers like Hans Reichenbach in Germany (who had his own Berlin Circle of philosophers) and A. J. Ayer in England visited Vienna, then returned home and promoted logical positivism across national borders and language barriers. Rudolf Carnap became the leading exponent of the Vienna Circle’s views; his landmark 1929 book The Logical Structure of the World established him as a towering figure in the positivist movement, and many of his students went on to become important philosophers in their own right.
Ayer
