Francine Patterson

Francine "Penny" Patterson (born February 13, 1947) is an American animal psychologist. She is best known for teaching a modified form of American Sign Language, which she calls "Gorilla Sign Language", or GSL, to a gorilla named Koko beginning in 1972.

Francine Patterson

Francine "Penny" Patterson (born February 13, 1947) is an American animal psychologist. She is best known for teaching a modified form of American Sign Language, which she calls "Gorilla Sign Language", or GSL, to a gorilla named Koko beginning in 1972.