Caleb Gattegno

Caleb Gattegno was an educator, psychologist and mathematician who lived from 1911 to 1988. He is considered one of the most influential and prolific mathematics educators of the twentieth century. He is best known for introducing new approaches to teaching and learning mathematics, called Visible and Tangible Math, foreign languages, called The Silent Way, and reading, called Words in Color. Gattegno also developed pedagogical materials for each of these approaches, and was the author of more than 120 books and hundreds of articles largely on the topics of education and human development.