Charles-Michel de l’Épée (1712-1789) did not invent sign language; rather, he learned it from the deaf community. Two pivotal factors contributed to the enduring impact of his method.

Initially, L’Épée observed twin sisters communicating in sign language, and later, he established the first classroom for deaf students. This environment provided an ideal setting for documenting sign language, which was then integrated into French grammar. This integration facilitated communication between deaf and non-deaf individuals without compromising the mimetic aspect of sign language, which aids in memorization.

The second crucial factor was the openness of L’Épée’s method to the public and other educators. Consequently, his approach laid the groundwork for modern American Sign Language (ASL), championed by one of his students, Laurent Clerc.

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