He has taught at several universities and also at the junior and senior high school levels in Japan. His main research interests include group dynamics within the language classroom, classroom interaction, motivation, and speaking. Task-Based Learning is another area of interest and Paul is a co-founder of the JALT TBL SIG. Paul has published research in several international journals, including International Journal of Applied Linguistics, Asia TEFL Journal, and The Language Learning Journal. Most recently Paul has co-authored a three-book series of textbooks based on a TBLT approach, and designed for use in classrooms in Japan and beyond.