Jacob Rodriguez Periera (1715-1780) was the inventor of dactylology, a method for teaching deaf-mutes to communicate. A crypto-Jew from Portugal, his first student was his sister. His methodology received phenomenal acclaim, he received honors from the King of France and was named to both the Royal Society of London. To view the Prezi used in this video and find other lectures, please click here: http://jewishhistorylectures.org/2014/04/04/jacob-rodrigues-pereira-jewish-teacher-of-deaf-mute-people-this-week-in-jewish-history/.