Harry Knoors is trained as a psycholinguist, specializing in language, and literacy of deaf children. He is involved in research on childhood deafness (mainly language, literacy and psychosocial development) and research on the effectiveness of special education, and has much experience with management, i.e. management of health care centers and of R&D department. He has published several books and more than 140 articles in international and Dutch journals about the consequences of childhood deafness for language and learning.Marc Marschark is a Professor at the National Technical Institute for the Deaf, a college of Rochester Institute of Technology, where he directs the Center for Education Research Partnerships. His research focuses on language comprehension and learning by deaf children and adults in formal and informal educational settings.