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Most people are surprised to learn how young the field of audiology actually is, and just how recently its founding father founded the profession. To put this in perspective, if you desired to find the founding father of biology, for instance, you’d have to go back in time by 2,300 years and read the The History of Animals, a natural history text composed in the fourth century BCE by the Ancient Greek philosopher Aristotle.

In contrast, to find the founding father of audiology, we need go back only 70 years, to 1945 when Raymond Carhart popularized the term. But who was Raymond Carhart, and how did he come to initiate a separate scientific field so recently? The narrative starts with World War II.

World War II and Hearing Loss

One of history’s greatest lessons tells us that necessity is the mother of invention, meaning that difficult scenarios prompt inventions focused on reducing the difficulty. Such was the case for audiology, as hearing loss was proving to be a bigger public health concern both during and after World War II.

In fact, the main driving force behind the advancement of audiology was World War II, which lead to military personnel returning from combat with extreme hearing impairment caused by direct exposure to loud sounds. While several speech pathologists had been calling for better hearing evaluation and therapy all along, the number of people suffering with hearing loss from World War II made the request impossible to dismiss.

Among those calling for a new discipline, Robert West, a well known speech pathologist, called for the development of the speech pathology discipline to include the correction of hearing in 1936 — the same year that Raymond Carhart would graduate with a Doctor of Philosophy degree in Speech Pathology, Experimental Phonetics and Psychology.

Raymond Carhart Establishes the New Science of Hearing

Raymond Carhart himself began his career in speech pathology. He received his Bachelor of Arts degree in Speech and Psychology from Dakota Wesleyan University in 1932 and his Master of Arts and Doctor of Philosophy degrees in Speech Pathology, Experimental Phonetics and Psychology at Northwestern University in 1934 and 1936. Carhart was in fact one of the department’s first two PhD graduates.

Just after graduation, Carhart became an instructor in Speech Re-education from 1936 to 1940. Then, in 1940 he was promoted to Assistant Professor and in 1943 to Associate Professor. It was what transpired next, however, that may have changed the course of history for audiology.

In 1944, Carhart was commissioned a captain in the Army to head the Deshon General Hospital aural rehabilitation program for war-deafened military personnel in Butler, Pennsylvania. It was here that Carhart, in the setting of assisting more than 16,000 hearing-impaired military personnel, popularized the term audiology, designating it as the science of hearing. From that point forward, audiology would separate from speech pathology as its own distinct research specialization.

At the end of the war, Carhart would return to Northwestern University to start the country’s first academic program in audiology. As a skilled teacher, he guided 45 doctoral students to the completion of their work, students who would themselves become respected professors, scientists, and clinical specialists throughout the country. And as a researcher, among numerous contributions, Carhart developed and enhanced speech audiometry, specifically as it applied to calculating the effectiveness of hearing aid performance. He even discovered a unique pattern on the audiogram that reveals otosclerosis (hardening of the middle ear bones), eponymously named the “Carhart notch.”

Raymond Carhart’s Place in History

Of history’s founding fathers, the name Raymond Carhart may not be as familiar as Aristotle, Isaac Newton, Albert Einstein, or Charles Darwin. But if you wear hearing aids, and you know the degree to which the quality of life is increased as the result, you might place Raymond Carhart on the same level as history’s greats. His students probably would, and if you visit the Frances Searle Building at Northwestern University, you’ll still see a plaque that reads:

“Raymond Carhart, Teacher, Scholar, and Friend. From his students.”

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