Hearing. A pastor at Giessen, Germany; became involved with deaf education when a Hessian nobleman asked him to teach his deaf son. His success in teaching speech led to other deaf pupils, including two girls from Switzerland. Published a book in 1777 about his methods, Praktische Unterweissung Taubstumme Personnen Reden und Schreiben zu Lehren. He accepted some natural signs, but did not teach or promote the use of signs, and also advocated beginning deaf education at a younger age.
The Conquest of Deafness, p.100-101.