 Salmon took an interest in the philosophy of space and time while attending Reichenbach’s courses as a graduate student at UCLA, and continued working on the topic for many years. His first publication in the field was the collection of essays Zeno’s Paradoxes (1970a), including contributions by Abner Shimony, Bertrand Russell, Henri Bergson, Max Black, J.O. Wisdom, James Thomson, Paul Benacerraf, G.E.L. Owen, and Adolf Grünbaum, plus a long introduction and an appendix on “Sets and Infinity” by Salmon himself. As stated at the beginning of the introduction, Salmon’s goal in bringing together the essays forming the collection was systematic rather than historical. His motivation lay in the conviction that after a long period in which Zeno’s paradoxes had been regarded as mere sophisms, from the middle of the Nineteenth and even more in the Twentieth century they had become the focus of sophisticated philosophical discussion. The articles included in the book tackle five of Zeno’s arguments, namely four paradoxes of motion and the paradox of plurality. At the heart of the paradoxes lies the problem of defining the notions of continuum and infinity. According to Salmon, such paradoxes cannot be solved in purely logical or mathematical terms because “it is also necessary to show how the abstract mathematical system can be used for the description of concrete physical reality” (Salmon 1970a: 16). It is worth noting that one of the chapters consists of a few pages taken from Russell’s Our Knowledge of the External World (1929) outlining his at-at theory of motion, which later played a key role within Salmon’s theory of causal processes (see  § 5.5.2).