Joan 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 interactional 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).

Stephen Daniel Looney is an Associate Teaching Professor in Applied Linguistics and Director of the International Teaching Assistant (ITA) Program in the Department of Applied Linguistics at the Pennsylvania State University, USA. His research takes a conversation analysis approach to analyzing teacher-student interaction in university STEM classrooms. He is an associate editor for the International Journal of Teaching and Learning in Higher Education.