Bell began teaching Visible Speech, a system developed by his father, to deaf students in Boston. This work provided him with invaluable insights into the nature of speech and hearing.

Bell became a strong advocate for oralism, a method of teaching deaf children to speak and lip-read rather than using sign language. This stance was controversial and remains debated to this day.

Bell founded the AAISD (later renamed the Alexander Graham Bell Association for the Deaf and Hard of Hearing) to promote the teaching of speech to deaf individuals.

Bell established the Volta Bureau (later renamed the Alexander Graham Bell Association for the Deaf and Hard of Hearing), an organization dedicated to research and information dissemination related to deafness.

Bell continued to support and advocate for deaf education throughout his life, contributing significantly to the development of teaching methods and technologies for the deaf.

At the moment of his death, every phone in the Bell system in the United States and Canada was silenced for one minute in tribute.