Joan Kelly HallJoan Kelly Hall is Professor of Applied Linguistics and Director of the Center for Research on English Language Learning and Teaching (CRELLT) at the Pennsylvania State University, USA. Her research centers on documenting the specialized interactiona practices and actions of teaching-and-learning found in instructional settings. Her most recent book is Essentials of SLA for L2 Teachers: A Transdisciplinary Framework (2019, Routledge). Read More Read Less