Green was the “father of laryngology” in America, and this is the first American treatise in otorhinolaryngology. He was the first successfully to introduce medicaments into the larynx, trachea, and bronchi for local treatment, using a probang, a curved instrument of whalebone 25 cm. long tipped with a tiny sponge. His claims in this connexion were the subject of bitter controversy in the U.S.A. It is possible that he somewhat exaggerated the efficacy of the methods he used and advocated.

Green was one of the few to remove a laryngeal tumor before the invention of the laryngoscope.