Yvonne van Zaalen is a professor, researcher, clinician, and in-demand speaker, whose contributions to understanding cluttering, its assessment, differential diagnosis, and treatment have made her one of the world’s leading experts in the field. Dr. van Zaalen is a Professor of Relational Care at the Hague University, the Netherlands, and is a recipient of the Deso Weiss Award for Excellence in the Field of Cluttering, sponsored by the Stuttering Foundation. Isabella Reichel is a professor at Touro University, USA. She is a Board-Certified Specialist in Fluency Disorders, a Fellow of the American Speech-Language-Hearing Association, and a recipient of the Deso Weiss Award for Excellence in the Field of Cluttering, sponsored by the Stuttering Foundation.