Richard T. W. Arthur is Professor Emeritus at McMaster University, Hamilton (Ontario), based in Toronto. He works in early modern natural philosophy and mathematics, and the foundations of physics, with special attention to the theory of time and the infinite. He holds degrees in physics (BA Oxford University, 1972) and philosophy (MA, McGill, 1976, PhD, Western Ontario, 1981). He has taught applied mathematics in Canada (UWO 1982-85), and philosophy in Nigeria (Calabar, 1981-82), the United States (Middlebury College, 1985-2002), Italy (Bologna 1998, Milan 2018), and Canada (McMaster, 2002-present). He is author of seven books and over 60 articles and book chapters. Translations by Jeffrey K. McDonough, Lea Schroeder, Samuel Levey, Richard T. W. Arthur, Richard Francks (with Roger Woolhouse), and Tzuchien Tho.