Thomas Brody (1922-1988) was born in Munich and studied in England and Switzerland. He worked as a chemical engineer in Italy and in Mexico and later concentrated on statistical problems in nuclear physics, probability theory, artificial intelligence, and simulation and computational methods. In his philosophical work, he desired to remove the barriers between physics and philosophy by discovering the philosophy implicit in the actual process of scientific research. He developed a theory of active epistemic cycles to explain how we come to know about things. This theory does justice to the richness and complexity of scientific research. Brody applied his ideas to a wide range of problems in the philosophy of physics, especially quantum mechanics, giving special attention to the Bell inequalities. The publication of his views was frequently blocked by the establishment, and his work has until now remained relatively unknown. In this thoughtful and wide-ranging book the author spells out many of the basic concepts of the philosophy of physics together with their consequences. Emphasis is given to the experimental side of physics, the process of construction of theories and the elaboration of the ensemble concept of probability. Also treated are the philosophical problems of quantum theory, including causality, realism, quantum logic and the meaning of Bell’s inequalities.