Phil Hiver is an Assistant Professor at Florida State University, USA. His research interests include instructed language learning and the role of psycho-social factors in second language teaching and learning.

Dr. Ali H. Al-Hoorie is an assistant professor at the English Language Institute, Education Sector, Royal Commission for Jubail and Yanbu, Saudi Arabia. He completed his PhD degree at the University of Nottingham under the supervision of Professors Zoltán Dörnyei and Norbert Schmitt. He also holds an MA in Social Science Data Analysis from Essex University. His research interests include motivation theory, research methodology, and complexity. His publications have appeared in a number of journals including Language Learning, The Modern Language Journal, Studies in Second Language Acquisition, ELT J, Language Teaching Research, and Learning and Individual Differences. He is also the co-author (with Phil Hiver) of the upcoming book Research Methods for Complexity in Applied Linguistics and a co-editor (with Peter D. MacIntyre) of Contemporary Language Motivation Theory: 60 Years Since Gardner and Lambert (1959).

Sarah Mercer is Professor and Head of the ELT Research and Methodology Department at the University of Graz, Austria. Her research interests lie in all aspects of language learning psychology (teacher and learner perspectives), in particular in self-related constructs, engagement, agency, affect, belief systems and wellbeing.