Mr. Greenan is an internationally known X-ray authority and President of Imaging Systems, Inc., and the Academy for Advanced Radiographic Studies. He has publications in numerous journals and textbooks on Dental Implants, Orthodontics and TMJ Radiology. Mr. Greenan is a member of the American Academy of Oral and Maxillofacial Radiology, the International Association of Dentomaxillofacial Radiology, the International College of Cranio-Mandibular Orthopedics, the Academy of Osseointegration and the International Association for Orthodontics. He is also the author of A Practical Atlas of TMJ and Cephalometric Radiology.
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