Hearing. Born at Aberdeen, Scotland; master of a private school at Oxford for 30 years and at one time also master of Elizabeth School on the island of Guernsey. In 1661, published a philosophical work in which he classified all knowledge and proposed a "universal" system of characters for writing this knowledge without using words from any specific language. This led to the 1680 publication of Didascalocophus, or The Deaf and Dumb Man's Tutor, which proposed a method of teaching the deaf to speak.
Arnold on the Education of the Deaf, p.20-23.