H. Gustav Mueller, PhD, is a Professor of Audiology at Vanderbilt University and holds faculty positions with the University of Northern Colorado and Rush University. He is the senior audiology consultant for the Sivantos Hearing Group and contributing editor for AudiologyOnline. Dr. Mueller is a founder of the American Academy of Audiology and a fellow of the American Speech and Hearing Association. He has published extensively in the areas of diagnostic audiology and hearing aid applications and has coauthored several books, including the Audiologists' Desk Reference (Volumes I and II), Fitting and Dispensing Hearing Aids (first edition), and Modern Hearing Aids (Volumes I and II).===============================================================================================Todd A. Ricketts is a professor at Vanderbilt University Medical Center, the director of graduate studies in the Department of Hearing and Speech Sciences, and the director of the Dan Maddox Hearing Aid Research Laboratory. He is a fellow of the American Speech and Hearing Association and the American Academy of Audiology. Dr. Ricketts' research focuses on various aspects of hearing, hearing aids, and cochlear implants, and he has published more than 100 articles and book chapters on the topics. ==================================================================================================Ruth Bentler is professor and chair in the Department of Communication Sciences and Disorder at the University of Iowa. A native Iowan, Dr. Bentler did not stray far from her roots, as her 40-year professional career has been at the University of Iowa, where she also obtained her professional degrees. She is a fellow of the American Speech and Hearing Association and the American Academy of Audiology. As the director of the Hearing Aid Laboratory for Basic and Applied Research, Dr. Bentler has been involved in numerous research endeavors involving the effectiveness of modern hearing aid features. She teaches graduate courses related to hearing aids and adult auditory rehabilitation, and has published more than 100 articles and book chapters on the topic.