William Labov
American linguist widely regarded as the founder of the discipline of variationist sociolinguistics.
Works (16)

Sociolinguistic patterns

The atlas of North American English

The Social Stratification of English in New York City

Language in the inner city

Principles of Linguistic Change

The Language of Life and Death

Out of the mouths of slaves

Locating language in time and space

Dialect Diversity in America

Sprache im sozialen Kontext

SOCIAL STRATIFICATION OF ENGLISH IN NEW YORK CITY

What is a Linguistic Fact?

Therapeutic discourse

Dialect divergence in America

Invitation to Cognitive Science Vol. 1

Principles of Linguistic Change, Vol. 2