(Also known as logical empiricism, logical neopositivism, neopositivism).  School of philosophy risen in Austria and Germany during 1920s, primarily  concerned with the logical analysis of scientific knowledge. Among its members  were Moritz Schlick, founder of the Vienna Circle, Rudolf Carnap, the leading  figure of logical positivism, Hans Reichenbach, founder of the Berlin Circle,  Herbert Feigl, Philipp Frank, Kurt Grelling, Hans Hahn, Carl Gustav Hempel,  Victor Kraft, Otto Neurath, Friedrich Waismann.

Logical positivists denied the soundness of metaphysics and traditional  philosophy; they asserted that many philosophical problems are indeed  meaningless. During 1930s the most important representatives of logical  positivism emigrated to the USA, where they influenced American philosophy.  Until 1950s logical positivism was the leading philosophy of science; today its  influence persists especially in the way of doing philosophy, in the great  attention given to the analysis of scientific thought and in the definitely  acquired results of the technical research on formal logic and the theory of  probability.

source IEP