Martin J. Ball is Honorary Professor at Prifysgol Bangor University, Wales, and former Professor of Speech-Language Pathology at Linköping University, Sweden. He has published many field-defining works and is a renowned scholar of clinical linguistics and Celtic languages.

Nicole Müller is Professor of Speech and Hearing Sciences in the School of Clinical Therapies at University College Cork, Ireland. She has published widely in the fields of clinical linguistics and speech and language pathology.

Elizabeth Spencer is Senior Lecturer of Speech Pathology at the University of Newcastle, Australia. She currently studies the effects of aging on language and performs discourse analysis within the field of speech pathology.