Gottlob Frege
![Frege in c. 1879](https://upload.wikimedia.org/wikipedia/commons/9/99/Young_frege.jpg)
His contributions include the development of modern logic in the ''Begriffsschrift'' and work in the foundations of mathematics. His book the ''Foundations of Arithmetic'' is the seminal text of the logicist project, and is cited by Michael Dummett as where to pinpoint the linguistic turn. His philosophical papers "On Sense and Reference" and "The Thought" are also widely cited. The former argues for two different types of meaning and descriptivism. In ''Foundations'' and "The Thought", Frege argues for Platonism against psychologism or formalism, concerning numbers and propositions respectively. Provided by Wikipedia
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