David Cassels Johnson is Professor of Multilingual Education at the University of Iowa. 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, teaches, and lectures about multilingual education policy and practice in different parts of the world. He is the author of Language Policy (2013, Palgrave Macmillan); co-author of The Language Gap: Normalizing Deficit Ideologies (2022, Routledge) and Epistemological and Theoretical Foundations in Language Policy and Planning (2023, Palgrave Macmillan); and co-editor of Research Methods in Language Policy and Planning: A Practical Guide (2015, Wiley Blackwell). He serves on six journal editorial boards, the Board of Trustees for the Center for Applied Linguistics, and he is the co-editor in chief of the journal Language Policy.