Sidury Christiansen, Ph.D. is an Associate Professor of TESOL/Applied Linguistics and Coordinator of the MA-TESL Program in the Bicultural Bilingual Studies department at the University of Texas at San Antonio. She is a Fulbright Scholar and a Department of State English Language Specialist. She specializes in the research and teaching of sociolinguistics and digital literacies among transnational bilinguals and English language learners. Her research explores the intersection between digital literacy and language ideologies, identities, and culture in offline and online social network environments. Her publications have appeared in the Journal of Sociolinguistics, Written Communication, and Lingua. Her most recent co-authored publication in TESOL Quarterly utilizes a chronotopic lens to the study of transborder digital literacy.