Laura Callahan is Associate Professor of Hispanic Linguistics in the Department of Foreign Languages and Literatures at The City College of New York. Her research has focused on codeswitching, language attitudes, communication between native and non-native speakers of Spanish, and heritage language maintenance. She is author of the books Spanish and English in U.S. Service Encounters (Palgrave Macmillan, 2009) and Spanish/English Codeswitching in a Written Corpus (John Benjamins, 2004). She has published articles in several journals, including Hispania, Language & Communication, Southwest Journal of Linguistics, Journal of Multilingual and Multicultural Development, Intercultural Pragmatics, International Multilingual Research Journal, Heritage Language Journal, and Language and Intercultural Communication. She has also taught at U.C. Berkeley, San José State University, and Michigan State University. She is a Research Fellow at the Research Institute for the Study of Language in Urban Society (RISLUS), Graduate Center, CUNY.