“Contemporary philosophy does not get much better than this.  Absolutely central philosophical questions concerning realism and the objectivity of both morals and mathematics are explored by a scholar with a truly unique proficiency in all the relevant philosophical and technical issues.  Naturalists drawn to moral anti-realism and mathematical realism in particular will have to grapple with the sophisticated arguments here, but this is a book anyone serious about philosophy has to read.”--Brian Leiter (University of Chicago)

"Morality and Mathematics is a real tour de force: it combines painstaking analysis and attention to technical details with far-reaching, often surprising philosophical conclusions. It is bound to change the landscape of philosophical debates in epistemology of morality and mathematics, separately and in relation with eachother, for years to come."--Catarina Dutilh Novaes (VU Amsterdam)

"Morality and Mathematics is a terrific book on the epistemological issues faced by realist views in mathematics and morality. Clarke-Doane provides a far more nuanced discussion of these issues than I've seen elsewhere, with sensitivity to what is common in the two domains, and what is different, and to the extent to which the apparent differences hide an underlying similarity. It is sure to become the standard work on this subject." --Hartry Field (NYU)

"Justin Clarke-Doane identifies and explores the shocking parallelism between morality and mathematics: on a surprising number of philosophical fronts, the two disparate subjects seem to face common problems and analogous solutions and rebuttals, whether the issue is realism, a priori justification, objectivity, naturalism or pluralism. With consummate philosophical skill, Clarke-Doane teases apart the differences and uncovers what is truly common and what is not. A remarkable philosophical work." --Joel David Hamkins (Oxford)

"Morality and mathematics would seem to be significantly divergent fields of inquiry. Justin Clarke-Doane is the rare philosopher with the requisite technical mastery of both fields to see past the superficial differences and highlight the important parallels lurking beneath, revealing how the issues of realism, objectivity, and justification we face in moral philosophy have close analogues in the foundations of mathematics, while noting what differences remain intact. This is a provocative and unique interdisciplinary contribution to how we understand truth and belief, with wide-ranging philosophical implications."--Sean Carroll (CalTech)

"Clarke-Doane's book offers a coherent and plausible set of answers to the notorious epistemological questions provoked by morality, and to the analogous questions that are provoked by mathematics. It is striking for its creativity, its rigorous arguments, its many subtle but important distinctions, its unusual breadth of expertise (covering philosophy of language, metaphysics, epistemology, philosophy of mathematics, and meta-ethics), and its rational control of a daunting battery of interactings considerations from these various branches of the subject. Exceptionally impressive philosophical talent and maturity are on display here. Needless to say, we probably haven't been given the final truth about these matters. But it's certain that anyone aiming to do better will have to grapple with Clarke-Doane's formidable arguments and conclusions." --Paul Horwich (NYU)