His academic interests include medical English discourse, presentation skills, testing, discourse analysis, English as a lingua franca, Asian Englishes, classroom methodologies, and culture in second language acquisition. He is the author of a number of textbooks and guidebooks, one novel, over 60 academic papers on applied linguistics and English education, and is an award-winning speaker who has presented papers and led seminars and workshops on over 200 occasions in nearly 20 countries.