He is the foundation Director of the Australian Stuttering Research Centre at The University of Sydney.

His background is in speech pathology, his research interests are epidemiology of early stuttering, mental health and stuttering, measurement of stuttering, and clinical trials for the disorder.

Recently, he started a work at the Centre to adapt successful stuttering treatments for eHealth presentation. He has published more than 200 papers in peer reviewed journals.

He is a member of the international Lidcombe Program Trainers Consortium and is in constant demand as a speaker internationally.