Welcome to the Department of Linguistics.

Linguistics is the scientific study of human language, from the sounds and gestures of speech up to the organization of words, sentences, and meaning. Linguistics is also concerned with the relationship between language and cognition, society, and history.

The Department of Linguistics at the University of Pennsylvania is the oldest modern linguistics department in the United States, founded by Zellig Harris in 1947. The department is known for its interdisciplinary research, spanning many subfields of linguistics, as well as integration of theory, corpus research, field work, and cognitive and computer science.

The department has both a graduate Ph.D. program and undergraduate major and minors. For the specializations of our faculty, please see the research section.

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All languages have exceptions alongside overarching rules and regularities. How does a young child tease them apart within just a few years of language acquisition? In this book, drawing an economic analogy, Charles Yang argues that just as the price of goods is determined by the balance between supply and demand, the price of linguistic productivity arises from the quantitative considerations of rules and exceptions. The learner postulates a productive rule only if it results in a more efficient organization of language, with the number of exceptions falling below a critical threshold. 

Supported by a wide range of cases with corpus evidence, Yang's Tolerance Principle gives a unified account of many long-standing puzzles in linguistics and psychology, including why children effortlessly acquire rules of language that perplex otherwise capable adults. His focus on computational efficiency provides novel insight on how language interacts with the other components of cognition and how the ability for language might have emerged during the course of human evolution.

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This book is the first since 1897 to describe the earliest reconstructable stages of the prehistory of English. It outlines the grammar of Proto-Indo-European, considers the changes by which one dialect of that prehistoric language developed into Proto-Germanic, and provides a detailed account of the grammar of Proto-Germanic. The next volume will consider the development of Proto-Germanic into Old English.

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This volume, which completes Labov’s seminal Principles of Linguistic Change trilogy, examines the cognitive and cultural factors responsible for linguistic change, tracing the life history of these developments, from triggering events to driving forces and endpoints. It explores the major insights obtained by combining sociolinguistics with the results of dialect geography on a large scale; demonstrates under what conditions dialects diverge from one another; and establishes an essential distinction between transmission within the community and diffusion across communities.

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Mark Liberman and Geoffrey Pullum collect some of their most insightful and amusing material from Language Log, their popular website. Often irreverent and hilarious, these brief essays take on many sacred cows. Language Log is a site where serious professional linguists go to have fun. There's plenty of fun and plenty to get you thinking about language in new ways in this collection.

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This book examines the diversity among American dialects and presents the counterintuitive finding that geographically localized dialects of North American English are increasingly diverging from one another over time. Labov describes the political forces that drive these ongoing changes, as well as the political consequences in public debate. The author also considers the recent geographical reversal of political parties in the Blue States and the Red States and the parallels between dialect differences and the results of recent presidential elections. Finally, in attempting to account for the history and geography of linguistic change among whites, Labov highlights fascinating correlations between patterns of linguistic divergence and the politics of race and slavery, going back to the antebellum United States. Complemented by an online collection of audio files that illustrate key dialectical nuances, Dialect Diversity in America offers an unparalleled sociolinguistic study from a preeminent scholar in the field.

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Drawing on cutting-edge developments in biology, neurology, psychology, and linguistics, Charles Yang's The Infinite Gift takes us inside the astonishingly complex but largely subconscious process by which children learn to talk and to understand the spoken word. Yang also puts forth an exciting new theory that we learn our native languages in part by unlearning the grammars of all the rest.