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Ponce de Leon (Spanish monk) taught deaf students with an emphasis on speech.
Juan Pablo Bonet continued the work with the book "The Simplification of Letters and the Art of Teaching the Mute to Speak." -
Abbe de L'Epee founded Institut National de Jeunes Sourds de Paris and used manual methods of teaching. Jean Massieu was the first deaf teacher of deaf students.
https://giving.gallaudet.edu/hof/pastinductees/the-abbe-charles-michel-de-lepee
https://www.youtube.com/watch?v=i78IaA5ZrEc -
Samuel Heinicke taught deaf students using only oral methods. Manual signs were not used at all.
https://www.youtube.com/watch?v=7nAGmvCl7OA -
Thomas Braidwood and the Braidwood family heavily guarded their teaching secrets. Used manual methods to teach, but focused on oral speech and writing.
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Thomas H. Gallaudet wanted to learn from the Braidwood's, but did not want to work for them in order to learn their teaching methods. Thomas met Laurent Clerc and convinced him to come back to America in order to help teach American deaf children.
http://www.gallaudet.edu/about/history-and-traditions/thomas-hopkins-gallaudet