Tammy Gregersen is Professor of TESOL at the University of Northern Iowa, USA. She has over 25 years of experience in the fields of language teaching methodology, language teacher training, learner variables, emotion and nonverbal communication in language learning.
Peter D. MacIntyre is Professor of Psychology at Cape Breton University, Canada. He has published widely in the areas of the psychology of communication, motivation, emotion, willingness to communicate, language acquisition and dynamic systems.