Brian Cantwell Smith

Brian Cantwell Smith (1950–2025) was the rarest of thinkers: a philosopher who had actually built the systems he theorized about. His 1982 MIT dissertation introduced computational reflection—the capacity of a program to represent and reason about its own operations—and the intimacy with machinery that project produced never left him. He spent the following four decades asking a question the field preferred to consider settled: what is a computer actually doing when it computes, and what would it take for that doing to become genuine understanding? His answer unfolded across two landmark books: On the Origin of Objects (1998), an ambitious metaphysics of how a world of discrete things gets carved from continuous reality, and The Promise of Artificial Intelligence: Reckoning and Judgment (2019), which brought that metaphysics to bear on the deep-learning era. The distinction at the core of the later work—between reckoning and judgment—is not a ranking of difficulty but a difference in kind: a system can