Catherine M. Mazak is Co-director of CeIBA (Centro para la Investigación del Bilingüismo y Aprendizaje/Center for Research on Bilingualism and Learning) and Associate Professor of English at the University of Puerto Rico, Mayagüez. She got her PhD in Critical Studies in the Teaching of English from Michigan State University and her M.A. in TESOL from the University of Arizona. She studies bilingualism in higher education using ethnographic and other qualitative research methods. Her latest line of research explores translanguaging practices in science teaching at the UPRM.