Sociolinguistics, language variation and change, sociophonetics, sociosyntax, corpus methods, language contact, multilingualism, language planning, language and ethnicity, Yiddish, Jewish language varieties
Syntax, semantics, morphosyntax, language variation and change, historical and comparative linguistics, language documentation and revitalization, Alaska Native and Native American languages (especially Aleut, Crow, Hidatsa, and Northern Pomo)
Anthropological linguistics, typology, documentation and description of Amazonian languages, South American historical and contact linguistics, language revitalization