William E. Harrell, DMD is in private orthodontic practice in Alexander City, Alabama. He worked with the late Dr. Bill Farrar in Montgomery, AL in the area of TMJ disorders and also does research in the area of 3-D imaging and TMJ disorders. Dr. Harrell is a part-time adjunct associate professor at the University of Alabama Department of Orthodontics, University of Alabama, Birmingham (UAB) School of Dentistry. Dr. Harrell is a national and international lecturer on the topic of 3-D imaging and TMJ disorders and has published numerous articles and chapters.