French professor of calligraphy known as the “father and apostle of the blind.” He was the brother of René-Just Haüy.

After seeing a group of blind men being cruelly exhibited in ridiculous garb in a Paris sideshow, Haüy decided to try to make the life of the blind more tolerable and help them gain a sense of usefulness. He set out by hiring a blind beggar boy to submit to instruction. In 1784 he established the Institution for Blind Children, Paris (afterward a state-supported school for blind children), where Louis Braille (Braille, Louis), inventor of the most widely used alphabet for the blind, was a student and later a teacher. Haüy foreshadowed Braille's work by discovering that sightless persons could decipher texts printed in embossed letters and by successfully teaching blind children to read.