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[[file:DavidLewis.jpg|thumb|DavidLewis]] '''David Kellogg Lewis''' (September 28, 1941 – October 14, 2001) was an American [[philosopher]] renowned for his work in [[metaphysics]], [[philosophy of language]], [[philosophy of mind]], and [[philosophical logic]]. He is best known for his theory of [[modal realism]], which posits the existence of an infinite number of possible worlds that are just as real as the actual world we live in.
'''David Kellogg Lewis''' (September 28, 1941 – October 14, 2001) was an American [[philosopher]] renowned for his work in [[metaphysics]], [[philosophy of language]], [[philosophy of mind]], and [[philosophical logic]]. He is best known for his theory of [[modal realism]], which posits that all possible worlds are as real as the actual world.


== Early Life and Education ==
== Early Life and Education ==
David Lewis was born in [[Oberlin, Ohio]]. He attended [[Swarthmore College]], where he earned his B.A. in philosophy in 1962. He then went on to study at [[Harvard University]], where he completed his Ph.D. in 1967 under the supervision of [[Willard Van Orman Quine]].
David Lewis was born in [[Oberlin, Ohio]], and was the son of a professor of government and a medieval historian. He attended [[Swarthmore College]], where he earned his bachelor's degree in philosophy. He then went on to study at [[Harvard University]], where he completed his Ph.D. under the supervision of [[Willard Van Orman Quine]].


== Academic Career ==
== Academic Career ==
Lewis began his teaching career at [[UCLA]] before moving to [[Princeton University]] in 1970, where he remained for the rest of his career. He was a prolific writer, publishing numerous influential papers and books.
Lewis began his teaching career at [[UCLA]] before moving to [[Princeton University]], where he spent the majority of his career. His work has had a significant impact on various areas of philosophy, particularly in the development of [[counterfactuals]] and the analysis of [[causation]].


== Philosophical Contributions ==
== Modal Realism ==
=== Modal Realism ===
One of Lewis's most influential contributions to philosophy is his theory of [[modal realism]]. According to this theory, possible worlds are not mere abstractions but are as concrete and real as the actual world we live in. This view has been both highly influential and controversial, sparking extensive debate and discussion in philosophical circles.
Lewis's most famous contribution to philosophy is his theory of [[modal realism]]. According to this theory, all possible worlds are as real as the actual world. This view contrasts with other theories of modality that treat possible worlds as mere abstractions or constructs.


=== Counterfactuals ===
== Other Contributions ==
In his book ''Counterfactuals'' (1973), Lewis developed a formal semantics for [[counterfactual conditionals]]. His approach uses the concept of possible worlds to analyze statements about what could have been the case if certain conditions had been different.
In addition to modal realism, Lewis made significant contributions to the [[philosophy of language]], particularly in the areas of [[convention (philosophy)|convention]] and [[language games]]. He also worked on the [[philosophy of mind]], exploring topics such as [[mental states]] and [[consciousness]].
 
=== Causation ===
Lewis also made significant contributions to the analysis of [[causation]]. His counterfactual theory of causation, which he elaborated in several papers, argues that an event A causes an event B if and only if, had A not occurred, B would not have occurred.
 
=== Philosophy of Mind ===
In the philosophy of mind, Lewis is known for his defense of [[functionalism]], the view that mental states are defined by their causal roles rather than by their intrinsic properties.
 
=== Convention ===
In his book ''Convention: A Philosophical Study'' (1969), Lewis analyzed the nature of social conventions and their role in coordinating human behavior. He argued that conventions are solutions to recurrent coordination problems.


== Personal Life ==
== Personal Life ==
Lewis was married to [[Stephanie Lewis]], a fellow philosopher. He was known for his modesty, wit, and generosity as a mentor and colleague.
Lewis was married to [[Stephanie Lewis]], a fellow philosopher, and they often collaborated on philosophical projects. He was known for his modesty and generosity in academic circles.


== Legacy ==
== Legacy ==
David Lewis's work continues to influence contemporary philosophy. His theories and ideas are widely discussed and debated, and his contributions have left a lasting impact on various fields within philosophy.
David Lewis's work continues to influence contemporary philosophy. His writings are widely studied and cited, and his ideas remain central to ongoing debates in metaphysics and other areas of philosophy.


== Related Pages ==
== Selected Works ==
* [[Metaphysics]]
* ''Counterfactuals'' (1973)
* [[Philosophy of language]]
* ''On the Plurality of Worlds'' (1986)
* [[Philosophy of mind]]
* ''Philosophical Papers'' (Volumes I and II)
 
== See Also ==
* [[Possible world]]
* [[Counterfactual conditional]]
* [[Philosophical logic]]
* [[Philosophical logic]]
* [[Modal realism]]
* [[Counterfactual conditionals]]
* [[Causation]]
* [[Functionalism (philosophy of mind)]]
* [[Convention (philosophy)]]
== References ==
{{Reflist}}


== External Links ==
== External Links ==
{{Wikiquote|David Lewis (philosopher)}}
* [https://plato.stanford.edu/entries/david-lewis/ Stanford Encyclopedia of Philosophy: David Lewis]
{{Commons category|David Lewis (philosopher)}}
 
[[Category:1941 births]]
[[Category:1941 births]]
[[Category:2001 deaths]]
[[Category:2001 deaths]]
[[Category:20th-century American philosophers]]
[[Category:American philosophers]]
[[Category:Metaphysicians]]
[[Category:Metaphysicians]]
[[Category:Philosophers of language]]
[[Category:Philosophers of language]]
[[Category:Philosophers of mind]]
[[Category:Philosophers of mind]]
[[Category:Princeton University faculty]]
[[Category:Harvard University alumni]]
[[Category:Harvard University alumni]]
[[Category:Princeton University faculty]]
[[Category:Swarthmore College alumni]]
[[Category:Swarthmore College alumni]]
[[Category:Philosophical logic]]
{{philosopher-stub}}

Latest revision as of 02:49, 9 March 2025

David Kellogg Lewis (September 28, 1941 – October 14, 2001) was an American philosopher renowned for his work in metaphysics, philosophy of language, philosophy of mind, and philosophical logic. He is best known for his theory of modal realism, which posits that all possible worlds are as real as the actual world.

Early Life and Education[edit]

David Lewis was born in Oberlin, Ohio, and was the son of a professor of government and a medieval historian. He attended Swarthmore College, where he earned his bachelor's degree in philosophy. He then went on to study at Harvard University, where he completed his Ph.D. under the supervision of Willard Van Orman Quine.

Academic Career[edit]

Lewis began his teaching career at UCLA before moving to Princeton University, where he spent the majority of his career. His work has had a significant impact on various areas of philosophy, particularly in the development of counterfactuals and the analysis of causation.

Modal Realism[edit]

One of Lewis's most influential contributions to philosophy is his theory of modal realism. According to this theory, possible worlds are not mere abstractions but are as concrete and real as the actual world we live in. This view has been both highly influential and controversial, sparking extensive debate and discussion in philosophical circles.

Other Contributions[edit]

In addition to modal realism, Lewis made significant contributions to the philosophy of language, particularly in the areas of convention and language games. He also worked on the philosophy of mind, exploring topics such as mental states and consciousness.

Personal Life[edit]

Lewis was married to Stephanie Lewis, a fellow philosopher, and they often collaborated on philosophical projects. He was known for his modesty and generosity in academic circles.

Legacy[edit]

David Lewis's work continues to influence contemporary philosophy. His writings are widely studied and cited, and his ideas remain central to ongoing debates in metaphysics and other areas of philosophy.

Selected Works[edit]

  • Counterfactuals (1973)
  • On the Plurality of Worlds (1986)
  • Philosophical Papers (Volumes I and II)

See Also[edit]

External Links[edit]