The Vienna Circle formed around several philosophers of the interwar era. Members of the circle dealt with issues of philosophy, linguistics, physics, mathematics, logic, social reforms, education, architecture and communication. "The circle seethed with loud arguments and silent distrust. And how could it be otherwise when philosophers meet?" The author created vivid portraits of the founders of the circle and its members: Moritz Schlick, Otto Neurath, Rudolf Karnap, Kurt Gödel, Karl Menger and others, as well as closely associated with the circle of Ludwig Wittgenstein and Karl Popper.