Christoph A. Hafner is Professor in the Department of English, City University of Hong Kong. He is the President of the Asia-Pacific LSP and Professional Communication Association and a past President of the Hong Kong Association for Applied Linguistics. He has published widely in the areas of English for specific purposes, digital literacies, and language learning and technology. His books include: The Handbook of English for Specific Purposes (2nd edition) (Wiley, 2025, co-edited with Sue Starfield), Understanding Digital Literacies: A Practical Introduction  (2nd edition) (Routledge, 2021, co-authored with Rodney Jones); and English in the Disciplines: A multidimensional model for ESP course design (Routledge, 2019, co-authored with Lindsay Miller). He co-edits two book series: Routledge Research in English for Specific Purposes and Routledge Introductions to English for Specific Purposes (both with Sue Starfield).