 Nearly always based in Latin American centers (Chile and Puerto Rico), Torretti is an icon of rigor and philosophical sense and an author of world-class level contributions; his writings are celebrated for his insightful commentaries and educated perspectives on the rational development of ideas, especially in Galileo, Newton, Leibniz, Kant, nineteenth-century mathematics, Helmholtz, Poincaré, and Einstein. Torretti’s major publications on these subjects have a secure place on the reading lists of leading seminars in philosophy of science anywhere, in particular Philosophy of Geometry from Riemann to Poincaré (1978), Relativity and Geometry (1985), Creative Understanding: Philosophical Reflections on Physics (1990), and The Philosophy of Physics (1999), each an authoritative work in the philosophy and the philosophical history of science. In the years that Torretti spent at the Rio Piedras Campus of Universidad de Puerto Rico, he led a fruitful career until his retirement in 1995. During most of this period he was the editor of Diálogos, one of the leading philosophy journals in Latin America.