He was a deaf educator from France who brought sign language to the United States in the early 19th century. He co-founded the American School for the Deaf in Hartford, Connecticut, and taught sign language to students there. The sign language he taught was based on the French Sign Language of his time.
It's important to note that although LSF and American Sign Language (ASL) share some similarities, they are distinct languages with their own grammar, vocabulary, and cultural elements.