David SingletonDavid Singleton is Fellow Emeritus, Trinity College Dublin, Ireland, Professor Emeritus, University of Pannonia, Hungary and Professor, University of Applied Sciences, Konin, Poland. He is the author of numerous monographs and textbooks, including >Key Topics in Second Language Acquisition (2014, with Vivian Cook, Multilingual Matters) and Beyond Age Effects in Instructional L2 Learning (2017, with Simone Pfenninger, Multilingual Matters). Read More Read Less