Marc’s primary research interest is in relations among language, learning, and development. His current research focuses on such relations by deaf children and adults in formal and informal educational settings. His research collaborations and educational consulting activities include deaf education partners in several countries. He also has appointments at the Moray House School of Education at the University of Edinburgh, the School of Psychology at the University of Aberdeen, and the Faculty of Health Sciences at the Catholic University of Portugal. He edits the Journal of Deaf Studies and Deaf Education and co-edits the Perspectives on Deafness and Professional Perspectives on Deafness: Evidence and Applications series, published by Oxford University Press. His books include Raising and Educating a Deaf Child, How Deaf Children Learn (with P. Hauser), Evidence-based Practice in Educating Deaf and Hard-of-Hearing Students (with P. Spencer), and Teaching Deaf Learners: Psychological and Developmental Foundations (with H. Knoors).