Because human communication under-lies and drives almost every aspect of our daily lives, a great premium is placed on vocal quality and clarity of expression. The human larynx is a complex neuromuscular organ that utilizes the power source of expired air from the lungs to generate an acoustical signal that eventually is transformed from voice to human speech, with its subtleties and nuances conveying information and emotion. The past 25 years have been a time of rich collaboration among many basic scientists, speech pathologists, and laryngologists, and this book is a manifestation of the obvious interest in the surgical aspects of voice preservation, restoration, and enhancement. This interest has become widespread during the past five years, a time of proliferation of voice laboratories, clinics, and institutes in the United States and other countries. These facilities have enjoyed the benefits of new technology that is available to provide objective measurements of