Saul Kripke is an American philosopher and logician who challenges the dominant descriptivist theory of reference in analytic philosophy. Through his lectures, he introduces the concept of names as "rigid designators" that refer to the same object across all possible worlds. He relies heavily on ordinary intuition and thought experiments to isolate metaphysical truths from linguistic conventions. His work fundamentally alters the philosophy of language by arguing that scientific discoveries establish necessary truths about the world.

Gottlob Frege is a foundational figure in modern analytic philosophy whose theories Kripke specifically targets for deconstruction. He establishes the classic formulation of descriptivism, which divides a proper name into its reference (the object) and its sense (the descriptive mode of presentation). Kripke argues that this framework mistakenly conflates the meaning of a name with the description used to fix its reference.

Bertrand Russell is a British philosopher and logician who develops the theory of definite descriptions. He argues that proper names function as disguised or abbreviated definite descriptions, suggesting that a name like "Walter Scott" is simply shorthand for "the author of Waverley." Kripke systematically attacks this view, demonstrating its inability to maintain consistency when applied to counterfactual scenarios and modal contexts.

Hilary Putnam is an American philosopher known for his theory of semantic externalism and the "Twin Earth" thought experiment. He argues that the reference of natural kind terms is determined by the underlying scientific essence of a substance in the external world. His conclusions about chemical structures complement Kripke's arguments about rigid designation.

Keith Donnellan is an American philosopher of language whose 1966 article creates a steppingstone for Kripke's broader arguments. Using the example of a man holding a martini glass actually filled with water, Donnellan demonstrates that a speaker can successfully refer to a specific individual even if the description they use is completely inaccurate. This insight paves the way for Kripke's causal-historical theory.

Ruth Barcan Marcus is an American logician whose formal systems of modal logic provide the mathematical and logical backdrop for Kripke's philosophical project. She proposes a "tag" theory of names that views them as labels devoid of descriptive content, directly anticipating Kripke's concept of rigid designation.

Ludwig Wittgenstein is an Austrian British philosopher who introduces the concept of "family resemblance" to explain how words function. He suggests that concepts are defined by a loose network of overlapping features rather than a single essential trait. Kripke uses the example of the standard meter stick to counter Wittgenstein's claims about definition and measurement.

John R. Searle is an American philosopher who attempts to rescue descriptivism from its obvious flaws by proposing that a name refers successfully if an object satisfies a sufficient, weighted number of associated descriptions. Kripke formulates Searle's view into a series of explicit theses before systematically dismantling them with thought experiments.

Willard Van Orman Quine is a philosopher whose skepticism provides a foil for Kripke's essentialism. Quine argues that whether a property is necessary depends entirely on how an object is described by a speaker. Kripke counters this stance by appealing to ordinary intuition regarding historical events.

Aristotle functions as a historical subject within Kripke's logical arguments. Kripke uses the ancient philosopher to demonstrate that the name "Aristotle" refers to the specific man regardless of whether he actually taught Alexander the Great or pursued philosophy at all, separating the person from his historical accomplishments.

Kurt Gödel is a famous mathematician whom Kripke uses as the subject of a critical thought experiment. Kripke posits a scenario where Gödel did not actually discover the incompleteness theorem but instead stole the work. This example proves that speakers using the name "Gödel" still successfully refer to the historical man, not the person who actually accomplished the work.

Schmidt is a fictional mathematician invented by Kripke to expose the flaws in the description theory of names. In Kripke's scenario, Schmidt is the true author of the incompleteness theorem. Kripke uses him to demonstrate that even if Schmidt satisfies the primary description associated with "Gödel," the name "Gödel" does not transfer its reference to Schmidt.