Robert Stalnaker
Possible-worlds semantics for conditionals, propositions, and pragmatic context
Stalnaker has taught at Yale, Cornell, and (since 1988) MIT. His 1968 paper "A Theory of Conditionals" introduced possible-worlds semantics for counterfactual conditionals — independently of and slightly before David Lewis's closely related but importantly different treatment in *Counterfactuals* (1973). His broader work — *Inquiry* (1984), *Context* (2014), and many collected essays — develops a pragmatist-influenced framework in which propositions are coarse-grained sets of possible worlds and assertion updates a common ground of mutual presupposition. Against Lewis's genuine modal realism, Stalnaker defends an "ersatzist" or "moderate realist" view: possible worlds are abstract maximal consistent ways the world might be. The Stalnaker-Lewis debate over counterfactuals is one of the canonical technical disputes of late-20th-century analytic philosophy of language.
Key works
- "A Theory of Conditionals" (1968)
- *Inquiry* (1984)
- *Context and Content* (1999)
- *Ways a World Might Be* (2003)
- *Our Knowledge of the Internal World* (2008)
- *Context* (2014)
Declared Influences
Analytic Metaphysics / Logical Atomism 40%
Pragmatism 25%
Naturalism 15%
Realism 15%
Structuralism 5%
Stalnaker is a central figure in late-20th-century analytic metaphysics and philosophy of language; his possible-worlds semantics has shaped multiple subfields (conditionals, propositional content, presupposition, pragmatic context).
"To suppose that A is to consider a possibility — a way the world might be — in which A is true." (*Inquiry*, ch. 4)
Stalnaker's account of assertion as a move that updates a common ground of mutual presupposition is pragmatist in structure: meaning is fixed by use in cooperative conversational practice.
"An assertion is a proposal to add the proposition expressed by the sentence to the common ground." (*Context and Content*, ch. 4)
Stalnaker is broadly naturalist: language and mind are natural phenomena to be studied with the tools of analytic philosophy and cognitive science; no first-philosophy presuppositions are required.
"The aim is to understand how language works as part of the natural world, not to legislate from outside." (paraphrasing programmatic remarks in *Inquiry*)
Modal realism in the moderate (ersatzist) sense: possible worlds are abstract entities — maximal consistent sets of propositions — not the concrete spatiotemporally-isolated worlds of Lewis. Real but not concrete.
"Possible worlds are ways things might have been, and they are abstract objects on a par with numbers and properties." (*Ways a World Might Be*, Introduction)
A faint affinity through the formal-relational nature of his semantics: propositions are individuated by their structural relations to other propositions in the space of possible worlds.
Propositions as sets of possible worlds is a structural account of content.
Internal Tensions
Coarse-grained propositions (sets of possible worlds) have well-known difficulties accommodating the apparent fine-grained distinctions between necessarily equivalent claims; Stalnaker's pragmatic-presuppositional refinements address some but not all of the cases. The disagreement with Lewis on conditional excluded middle and on the metaphysics of worlds remains open.
I. Time
Standard relativistic physical time.
Attributes
II. Space
Standard relativistic space-time; the possible-worlds machinery operates over abstract structures, not concrete worlds.
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III. Matter
Substantival; ontology of the actual world is whatever physics says.
Attributes
IV. Observer
Embodied epistemic agent; assertions and inquiries make sense in cooperative conversational contexts.
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V. Energy
Conventional.
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VI. Information
Propositional content is set-theoretic — propositions as sets of possible worlds — and is conserved across logical-conversational manipulation.
Attributes
Classified works
Works in the atlas that Robert Stalnaker authored or that draw on this persona's writings, with full attribute fingerprints of their own.
Computed school proximity
The persona's attribute fingerprint scored against all 202 schools using the same quiz scorer. Useful as a sanity check on the hand-curated influences above.
Philosophical neighbors
Other personas whose attribute fingerprint sits closest to Robert Stalnaker's — intellectual neighbors across traditions and eras.
How Robert Stalnaker resolves each dilemma
52 resolved positions across 4 dimensions · 5 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.
Time · 9 dilemmas, all mainstream
Matter · 7 dilemmas, all mainstream
Observer · 37 dilemmas, all mainstream
Information · 4 dilemmas, all mainstream
Appears in Debates (1)
Films Referencing This Persona (8)
Either directly referenced in the film, or reading the film through one of this persona's top schools.
Experiments Engaging This Persona's Schools
Surface via influence-schools that respond to the experiment. Each entry shows the school through which the connection runs.