Early work

McDowell's earliest published work was in ancient philosophy, most notably including a translation of and commentary on Plato's Theaetetus. In the 1970s he was active in the Davidsonian project of providing a semantic theory for natural language, co-editing (with Gareth Evans) a volume of essays entitled Truth and Meaning. McDowell edited and published Evans's influential posthumous book The Varieties of Reference (1982).

In his early work, McDowell was very much involved both with the development of the Davidsonian semantic programme and with the internecine dispute between those who take the core of a theory that can play the role of a theory of meaning to involve the grasp of truth conditions, and those, such as Michael Dummett, who argued that linguistic understanding must, at its core, involve the grasp of assertion conditions. If, Dummett argued, the core of a theory that is going to do duty for a theory of a meaning is supposed to represent a speaker's understanding, then that understanding must be something of which a speaker can manifest a grasp. McDowell argued, against this Dummettian view and its development by such contemporaries as Crispin Wright, both that this claim did not, as Dummett supposed, represent a Wittgensteinian requirement on a theory of meaning and that it rested on a suspect asymmetry between the evidence for the expressions of mind in the speech of others and the thoughts so expressed. This particular argument reflects McDowell's wider commitment to the idea that, when we understand others, we do so from "inside" our own practices: Wright and Dummett are treated as pushing the claims of explanation too far and as continuing Willard Van Orman Quine's project of understanding linguistic behaviour from an "external" perspective.

In these early exchanges and in the parallel debate over the proper understanding of Wittgenstein's remarks on rule-following, some of McDowell's characteristic intellectual stances were formed: to borrow a Wittgensteinian expression, the defence of a realism without empiricism, an emphasis on the human limits of our aspiration to objectivity, the idea that meaning and mind can be directly manifested in the action, particularly linguistic action, of other people, and a distinctive disjunctive theory of perceptual experience.

The latter is an account of perceptual experience, developed at the service of McDowell's realism, in which it is denied that the argument from illusion supports an indirect or representative theory of perception as that argument presupposes that there is a "highest common factor" shared by veridical and illusory (or, more accurately, delusive) experiences. (There is clearly a distinction between perceiving and acquiring a belief: one can see an "apparently bent" stick in the water but not believe that it is bent as one knows that one's experience is illusory. In illusions, you need not believe that things are as the illusory experiences represent them as being; in delusions, a person believes what their experience represents to them. So the argument from illusion is better described as an argument from delusion if it is to make its central point.)

In the classic argument from illusion (delusion) you are asked to compare a case where you succeed in perceiving, say, a cat on a mat, to the case where a trick of light deceives you and form the belief that the cat is on the mat, when it is not. The proponent of the argument then says that the two states of mind in these contrasting cases share something important in common, and to characterise this we need to introduce an idea like that of "sense data." Acquaintance with such data is the "highest common factor" across the two cases. That seems to force us into a concession that our knowledge of the external world is indirect and mediated via such sense data. McDowell strongly resists this argument: he does not deny that there is something psychologically in common between the subject who really sees the cat and the one that fails to do so. But that psychological commonality has no bearing on the status of the judger's state of mind from the point of view of assessing whether she is in a position to acquire knowledge. In favourable conditions, experience can be such as to make manifest the presence of objects to observers – that is perceptual knowledge. When we succeed in knowing something by perceiving it, experience does not fall short of the fact known. But this just shows that a successful and a failed perceptual thought have nothing interesting in common from the point of view of appraising them as knowledge.

In this claim that a veridical perception and a non-veridical perception share no highest common factor, a theme is visible which runs throughout McDowell's work, namely, a commitment to seeing thoughts as essentially individuable only in their social and physical environment, so called externalism about the mental. McDowell defends, in addition to a general externalism about the mental, a specific thesis about the understanding of demonstrative expressions as involving so-called "singular" or "Russellian" thoughts about particular objects that reflects the influence on his views of Gareth Evans. According to this view, if the putative object picked out by the demonstrative does not exist, then such an object dependent thought cannot exist – it is, in the most literal sense, not available to be thought.

Value theory

In parallel with the development of this work on mind and language, McDowell also made significant contributions to moral philosophy, specifically meta-ethical debates over the nature of moral reasons and moral objectivity. McDowell developed the view that has come to be known as secondary property realism, or sensibility or moral sense theory. The theory proceeds via the device of an ideally virtuous agent: such an agent has two connected capacities. She has the right concepts and the correct grasp of concepts to think about situations in which she finds herself by coming to moral beliefs. Secondly, for such a person such moral beliefs are automatically over-riding over other reasons she may have and in a particular way: they "silence" other reasons, as McDowell puts it. He believes that this is the best way to capture the traditional idea that moral reasons are specially authoritative.

McDowell rejects the Humean theory that every intentional action is the result of a combination of a belief and a desire, with the belief passively supplying a representation and the desire supplying the motivation. McDowell, following Thomas Nagel, holds that the virtuous agent's perception of the circumstances (i.e. her belief) justifies both the action and the desire. In order to understand the desire, we must understand the circumstances that the agent experienced and that compelled her to act. So, while the Humean thesis may be true about explanation, it is not true about the structure of justification— it should be replaced by Nagel's motivated desire theory.^[18]

Implicit in this account is a theory of the metaphysical status of values: moral agents form beliefs about the moral facts, which can be straightforwardly true or false. However, the facts themselves, like facts about colour experience, combine anthropocentricity with realism. Values are not there in the world for any observer, for example, one without our human interest in morality. However, in that sense, colours are not in the world either, but one cannot deny that colours are both present in our experience and needed for good explanations in our common sense understanding of the world. The test for the reality of a property is whether it is used in judgements for which there are developed standards of rational argument and whether they are needed to explain aspects of our experience that are otherwise inexplicable. McDowell thinks that moral properties pass both of these tests. There are established standards of rational argument and moral properties fall into the general class of those properties that are both anthropocentric but real.

The connection between McDowell's general metaphysics and this particular claim about moral properties is that all claims about objectivity are to be made from the internal perspective of our actual practices, the part of his view that he takes from the later Wittgenstein. There is no standpoint from outside our best theories of thought and language from which we can classify secondary properties as "second grade" or "less real" than the properties described, for example, by a mature science such as physics. Characterising the place of values in our worldview is not, in McDowell's view, to downgrade them as less real than talk of quarks or the Higgs boson.

Later work: Mind and World (1994)

McDowell's later work reflects the influence of Georg Wilhelm Friedrich Hegel, P. F. Strawson, Robert Brandom, Rorty and Sellars; both Mind and World and the Woodbridge lectures focus on a broadly Kantian understanding of intentionality, of the mind's capacity to represent. Influenced by Sellars's famous diagnosis of the "myth of the given" in traditional empiricism,^[19] McDowell's goal in Mind and World is to explain how we are passive in our perceptual experience of the world, but active in conceptualizing it. In his account, he tries to avoid any connection with idealism, and develops an account of what Kant called the "spontaneity" of our judgement in perceptual experience.

Mind and World rejects a reductively naturalistic account: what McDowell calls "bald naturalism." He contrasts this with his own "naturalistic" perspective in which the distinctive capacities of mind are a cultural achievement of our "second nature", an idea that he adapts from Gadamer. The book concludes with a critique of Quine's narrow conception of empirical experience and also a critique of Donald Davidson's views on belief as inherently veridical, in which Davidson plays the role of the pure coherentist.

In his later work, McDowell denies that there is any philosophical use for the idea of nonconceptual content— the idea that our experience contains representations that are not conceptually structured. Starting with a careful reading of Sellars' "myth of the given", he argues that we need to separate the use of concepts in experience from a causal account of the pre-conditions of experience. He argues that the idea of "nonconceptual content" is philosophically unacceptable because it straddles the boundary between these two. This denial of nonconceptual content has provoked considerable discussion because other philosophers have claimed that scientific accounts of our mental lives (particularly in the cognitive sciences) need this idea.

While Mind and World represents an important contemporary development of a Kantian approach to philosophy of mind and metaphysics, one or two of the uncharitable interpretations of Kant's work in that book receive important revisions in McDowell's later Woodbridge Lectures, published in the Journal of Philosophy, Vol. 95, 1998, pp. 431–491. Those lectures are explicitly about Wilfrid Sellars, and assess whether or not Sellars lived up to his own critical principles in developing his interpretation of Kant (McDowell claims not). McDowell has, since the publication of Mind and World, largely continued to re-iterate his distinctive positions that go against the grain of much contemporary work on language, mind and value, particularly in North America where the influence of Wittgenstein has significantly waned.

Influences

McDowell's work has been heavily influenced by, among others, GWF Hegel, Aristotle, Ludwig Wittgenstein, P. F. Strawson, David Wiggins, and, especially in the case of his later work, Wilfrid Sellars. Many of the central themes in McDowell's work have also been pursued in similar ways by his Pittsburgh colleague Robert Brandom (though McDowell has stated strong disagreement with some of Brandom's readings and appropriations of his work). Both have been influenced by Richard Rorty, in particular Rorty's Philosophy and the Mirror of Nature (1979). In the preface to Mind and World (pp. ix–x) McDowell states that "it will be obvious that Rorty's work is [...] central for the way I define my stance here." McDowell's own work has been criticized for its "sometimes cryptic prose."^[6]

Books

• Plato, Theaetetus, translated with notes (Clarendon Press, Oxford, 1973)
• (Editor) Gareth Evans, The Varieties of Reference (Clarendon Press, Oxford, 1982)
• Mind and World (Cambridge, Mass.: Harvard University Press, 1994)
• Mind, Value, and Reality (Cambridge, Mass.: Harvard University Press, 1998)
• Meaning, Knowledge, and Reality (Cambridge, Massachusetts: Harvard University Press, 1998)
• Having the World in View: Essays on Kant, Hegel, and Sellars (Cambridge, Massachusetts: Harvard University Press, 2009)
• The Engaged Intellect: Philosophical Essays (Cambridge, Massachusetts: Harvard University Press, 2009)

Selected articles