Who was the inventor or creator of sign language and how did it affect the lives of the deaf?

The creator of sign language is Abbe Charles Michel de L'Epee

Explanation:

And because of that accomplishment the deaf have happier life's because now they can communicate to each other.

The inventor/creator of sign language is Juan Pablo Bonet, it affected the lives of the deaf a good way because they could have a better way to communicate with one another.

Explanation:

People were deaf back then, of course, and had ways to communicate through gesture. It was not understood then as a language, and Deafness was not well understood. The first notable pioneer, perhaps inventor of sign language is Juan Pablo Bonet. He was a Spanish secretary to a wealthy family.