He completed his studies (as a medical doctor) at the University of Vienna and (as pianist) at the State Academy of Music and Performing Arts.
He coauthored the fundamental textbook on voice and speech medicine (Lehrbuch der Stimm- und Sprachheilkunde, first edition Vienna, 1949) together with the Swiss phoniatre Richard Luchsinger (1900–1993).
[3] In 1962, Arnold developed the method to inject teflon into the vocal cords[4] und coined the term "phonosurgery"[5] with Hans von Leden the following year.
Arnold was founding director of the Division of Otolaryngology[6] in the University of Mississippi Medical Center,[7] Jackson, 1963–79.
Although the text was now written several decades ago, the topics covered are quite similar to those in a contemporary voice textbook, which shows how advanced the study of phoniatry was compared to other subdivisions of Speech Language Pathology at the time.