J. S. Ullian is an American analytic philosopher best known for co-authoring 'The Web of Belief' with W. V. O. Quine. His work focuses on epistemology, the logic of belief revision, and the rational grounds for accepting or rejecting claims. He has also engaged with questions at the intersection of epistemology and philosophy of religion.
Co-authored 'The Web of Belief' with W. V. O. Quine, a foundational text in epistemology and belief revision
Advanced naturalistic epistemology within the Quinean pragmatist tradition
Contributed to analytic treatments of religious epistemology and the justification of religious institutions
Worked on the logic of hypothesis acceptance and the criteria for rational belief