David Cassels Johnson is Professor of Multilingual Education at the University of Iowa and Visiting Professor of Language Policy and Planning at Shanghai International Studies University. He holds a Ph.D. (with distinction) in Educational Linguistics from the University of Pennsylvania. His areas of expertise include Sociolinguistics, Discourse Analysis, ESL/Bilingual Education, and Language Policy and Planning. His research, teaching, and service focus on how language policies impact educational opportunities for minoritized language users in schools and society. Before joining the University of Iowa in 2013, he held faculty positions in education and linguistics at Washington State University and Texas A&M University and was a visiting lecturer at the University of Equatorial Guinea and the University of Costa Rica. He consults and lectures about language policy and educational equity in different parts of the world. He has published over 45 books, book chapters, and journal articles and serves on the editorial board of six journals.