•  389
    The Normative Profile of Knowledge by Acquaintance
    Philosophy and Phenomenological Research. 2026.
    ABSTRACT Many philosophers have found it plausible that sense experience affords a species of nonpropositional awareness and knowledge, what Russell termed “knowledge by acquaintance.” At the same time, a prominent strand in epistemology maintains that knowledge has a distinctive normative profile: it is embedded in justificatory relations, serves as a standard of success for underlying attitudes, grounds regulative norms, and qualifies as a cognitive achievement. Yet it remains unclear how a no…Read more
  •  5
    The Nature of Law
    with Andrei Marmor and Alexander Sarch
    Stanford Encyclopedia of Philosophy. 2001.
  •  3
    Philosophy of Contract Law
    with Daniel Markovits
    Stanford Encyclopedia of Philosophy. 2021.
  •  425
    Justice as Law's Constitutive Virtue: A Functional Reassessment
    Oxford Studies in Philosophy of Law, Vol. 7. forthcoming.
    Some kinds can succeed or fail on their own terms. A clock that loses minutes is defective as a clock; a university that abandons teaching and research becomes deficient as a university. Pebbles and numbers, by contrast, are not evaluable in this way. Philosophers often place law in the first category, and some go further still: they claim that unjust law is defective as law. Yet the leading arguments for this claim—appeals to central cases (Finnis 2011), law’s characteristic activities (Murphy …Read more
  •  71
    Contemporary Non-Positivism
    Cambridge University Press. 2025.
    This Element defends and clarifies the thesis that the legality of a system of rules depends on its moral features. Positivists who deny this dependence struggle to explain: (1) the traditional classification of moral norms as a form of a priori law; (2) judicial reliance on moral norms in legal discovery; (3) persistent theoretical disagreement about intra-systemic, law-determining facts; (4) why radically arbitrary or immoral schemes of social organization represent borderline cases of law; an…Read more
  •  928
    Knowledge by Acquaintance and Impartial Virtue
    Philosophical Studies 182 (3): 911-937. 2025.
    Russell (1911/12) argued that perceptual experience grounds a species of non-propositional knowledge, “knowledge by acquaintance,” and in recent years, this account of knowledge has been gaining traction. I defend on its basis a connection between moral and epistemic failure. I argue, first, that insufficient concern for the suffering of others can be explained in terms of an agent’s lack of acquaintance knowledge of another’s suffering, and second, that empathy improves our epistemic situation.…Read more
  •  854
    Law, the Rule of Law, and Goodness-Fixing Kinds
    Engaging Raz: Themes in Normative Philosophy (OUP). forthcoming.
    Laws can be evaluated as better or worse relative to different normative standards. But the standard set by the Rule of Law defines a kind-relative standard of evaluation: features like generality, publicity, and non-retroactivity make the law better as law. This fact about legal evaluation invites a comparison between law and other “goodness-fixing kinds,” where a kind is goodness-fixing if what it is to be a member of the kind fixes a standard for evaluating instances as better or worse. Indee…Read more
  •  698
    Reasonable Moral Doubt
    New York University Law Review 97 1373-1425. 2022.
    Sentencing outcomes turn on moral and evaluative determinations. For example, a finding of “irreparable corruption” is generally a precondition for juvenile life without parole. A finding that the “aggravating factors outweigh the mitigating factors” determines whether a defendant receives the death penalty. Should such moral determinations that expose defendants to extraordinary penalties be subject to a standard of proof? A broad range of federal and state courts have purported to decide this …Read more
  •  1138
    I Feel Your Pain: Acquaintance & the Limits of Empathy
    In Uriah Kriegel (ed.), Oxford Studies in Philosophy of Mind Vol 4, Oxford University Press. pp. 277-308. 2024.
    The kind of empathy that is communicated through expressions like “I feel your pain” or “I share your sadness” is important, but peculiar. For it seems to require something perplexing and elusive: sharing another’s experience. It’s not clear how this is possible. We each experience the world from our own point of view, which no one else occupies. It’s also unclear exactly why it is so important that we share others' pains. If you are in pain, then why should it matter, and be a good thing, that …Read more
  •  2272
    Acquaintance, knowledge, and value
    Synthese 199 (5-6): 14035-14062. 2021.
    Taking perceptual experience to consist in a relation of acquaintance with the sensible qualities, I argue that the state of being acquainted with a sensible quality is intrinsically a form of knowledge, and not merely a means to more familiar kinds of knowledge, such as propositional or dispositional knowledge. We should accept the epistemic claim for its explanatory power and theoretical usefulness. That acquaintance is knowledge best explains the intuitive epistemic appeal of ‘Edenic’ counter…Read more
  •  74
    Philosophy of Contract Law
    with Daniel Markovits
    Stanford Encyclopedia of Philosophy. 2021.
    The law of contracts, at least in its orthodox expression, concerns voluntary, or chosen, legal obligations. When Brody accepts Susan’s offer to sell him a canoe for a set price, the parties’ choices alter their legal rights and duties. Their success at changing the legal landscape depends on a background system of rules that specify when and how contractual acts have legal effects, rules that give the offer and acceptance of a bargain-exchange a central role in generating obligations. Contract …Read more
  •  4194
    Legal Positivism and the Moral Origins of Legal Systems
    Canadian Journal of Law and Jurisprudence 36 (1): 37-64. 2023.
    Legal positivists maintain that the legality of a rule is fundamentally determined by social facts. Yet for much of legal history, ordinary officials used legal terminology in ways that seem inconsistent with positivism. Judges regularly cited, analyzed, and predicated their decisions on the ‘laws of justice’ which they claimed had universal legal import. This practice, though well-documented by historians, has received surprisingly little philosophical attention; I argue that it invites explana…Read more
  •  562
    Review of "Natural Law & the Nature of Law" by Jonathan Crowe
    Notre Dame Philosophical Reviews 2020. 2020.
    Commentary on Crowe's metaethics and his theory of law as a goodness-fixing kind.
  •  1497
    There are No Easy Counterexamples to Legal Anti-positivism
    Journal of Ethics and Social Philosophy 17 (1): 1-26. 2020.
    Legal anti-positivism is widely believed to be a general theory of law that generates far too many false negatives. If anti-positivism is true, certain rules bearing all the hallmarks of legality are not in fact legal. This impression, fostered by both positivists and anti-positivists, stems from an overly narrow conception of the kinds of moral facts that ground legal facts: roughly, facts about what is morally optimific—morally best or morally justified or morally obligatory given our social p…Read more
  •  1234
    Supervenience, Repeatability, & Expressivism
    Noûs 54 (3): 578-599. 2019.
    Expressivists traditionally explain normative supervenience by saying it is a conceptual truth. I argue against this tradition in two steps. First, I show the modal claim that stands in need of explanation has been stated imprecisely. Classic arguments in metaethics for normative supervenience and those that rely on it as a premise presuppose a constraint on the supervenience base that is rarely (if ever) made explicit: the repeatability of the non-normative properties on which the normative sup…Read more
  •  99
    Legal Obligation & Its Limits
    Law and Philosophy 38 (2): 109-147. 2019.
    Judges decide cases by appeal to rules of general application they deem to be law. If a candidate rule resolves the case and is, ex ante and independently of the judge’s judgment, the law, then the judge has a legal obligation to declare it as such and follow it. That, at any rate, is conventional wisdom. Yet the principle is false – a rule’s being law or the judge’s believing it to be law is neither necessary nor even sufficient for a judge being legally obliged to follow it. The principle’s fa…Read more
  •  215
    On Ground as a Guide to Realism
    Ratio 31 (2): 165-178. 2018.
    According to Fine (among others), a nonbasic factual proposition must be grounded in facts involving those of its constituents that are both real and fundamental. But the principle is vulnerable to several dialectically significant counterexamples. It entails, for example, that a logical Platonist cannot accept that true disjunctions are grounded in the truth of their disjuncts; that a Platonist about mathematical objects cannot accept that sets are grounded in their members; and that a color pr…Read more
  •  203
    How to be impartial as a subjectivist
    Philosophical Studies 173 (3): 757-779. 2016.
    The metaethical subjectivist claims that there is nothing more to a moral disagreement than a conflict in the desires of the parties involved. Recently, David Enoch has argued that metaethical subjectivism has unacceptable ethical implications. If the subjectivist is right about moral disagreement, then it follows, according to Enoch, that we cannot stand our ground in moral disagreements without violating the demands of impartiality. For being impartial, we’re told, involves being willing to co…Read more