Answer:
He and Dr. Mason Cogswell founded a school for the Deaf.
Explanation:
Dr. Thomas Hopkins Gallaudet was an American who taught children history and geography, while he was a salesman. However, he met a deaf girl Alice Cogswell who was on her own and nobody was playing with and he tried communicating with her.
Eventually, he was financed by her father Dr. Mason Cogswell to go to Europe to study methods for teaching the Deaf and when he returned, He and Dr. Mason Cogswell founded a school for the Deaf, the Connecticut Asylum for the Education and Instruction of Deaf and Dumb Persons.