Justin Davidson is Assistant Professor of Spanish and Romance Linguistics in the Department of Spanish and Portuguese at the University of California, Berkeley. Professor Davidson received his Ph.D. from the University of Illinois (Urbana-Champaign) with a doctoral thesis on “Social Dynamics of Catalan-Spanish Contact in the Evolution of Catalonian Spanish.” His research focuses broadly on the social dimensions of language-change, with an emphasis on socio-phonetics and inter-language contact. More specifically, he is interested in the bi-directional effects of language contact between Spanish and Catalan and the dynamics of language use in bilingual speech communities. He has published on the diachronic development of diaspora varieties of Catalan from a framework of sociohistorical linguistics, as well as the variable acquisition of Spanish inflectional morphology by U.S. heritage speakers and L2-learners using empirical methodologies informed by the fields of second language acquisition and psycholinguistics. His ongoing onsite project, the Corpus of Bay Area Spanish (CBAS), responds to specific questions regarding Spanish-English language contact as manifested in the diverse population of Spanish-speakers living in the Bay Area (corresponding to approximately 25% of the total Bay Area population).