Dennis C. Tanner, PhD received his Doctor of Philosophy degree in Audiology and Speech Sciences from Michigan State University. He is a prolific author of books, diagnostic tests, and treatment programs. Dr. Tanner is the owner of Tanner Rehabilitation Services, Inc., a provider of speech and hearing services in Arizona for 40 years. He serves as an expert witness in legal cases involving communication sciences and disorders. Dr. Tanner is Professor Emeritus of Health Sciences at Northern Arizona University and was named “Outstanding Educator” by the Association of Schools of Allied Health Professions and the “Teacher of the Year” for the College of Health Professions. He is also an honorary professor at Tehran University of Medical Sciences, Tehran, Iran. Visit his website at www?.drdennistanner?.com.