Portrait of Professor Jon Williamson

Professor Jon Williamson

Professor of Reasoning, Inference and Scientific Method


Jon Williamson works in the area of philosophy of science and medicine. He is co-director of the Centre for Reasoning and is a member of the Theoretical Reasoning research cluster

Research interests

Professor Jon Williamson works on the philosophy of causality, the foundations of probability, formal epistemology, inductive logic, and the use of causality, probability and inference methods in science and medicine.

His books Bayesian Nets and Causality and In Defence of Objective Bayesianism develop the view that causality and probability are features of the way we reason about the world, not a part of the world itself. His books Probabilistic Logics and Probabilistic Networks and Lectures on Inductive Logic apply recent developments in Bayesianism to motivate a new approach to inductive logic. 

Jon's latest book, Evaluating Evidence of Mechanisms in Medicine, seeks to broaden the range of evidence considered by evidence-based medicine. Jon can be found on Twitter @Jon_Williamson_.


Jon teaches logic and reasoning.

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