Dr. H. Gustav Mueller is Professor of Audiology, Vanderbilt University, and has a private consulting practice in Bismarck, ND. He is the Senior Audiology consultant for Siemens Hearing Instruments and Contributing Editor for The Hearing Journal. He also holds faculty positions with Central Michigan University, University of Northern Colorado and Rush University. Dr. Mueller is a Founder of the American Academy of Audiology, and serves on the Editorial Boards of several audiology journals. He is an internationally-known workshop lecturer, and has published more than 150 articles and book chapters on diagnostic audiology and hearing aid applications. He is the senior author of the books "Communication Disorders in Aging," "Probe Microphone Measurements," and the co-author of "The Audiologists' Desk Reference, Volumes I and II."