David MacDonald, BDS, BSc (Hons.), LLB (Hons.), MSc (Lond.), DDS (Edin.), DDRRCR (UK), FDSRCPS, FRCDC, is Professor and Chair of Oral and Maxillofacial Radiology at the University of British Columbia in Vancouver, Canada; Consultant to the British Columbia Cancer Agency in Vancouver, Canada; and Regional Director (North America) for the International Association of Dento-Maxillo-Facial Radiology.