J. P. Guilford

Joy Paul Guilford (March 7, 1897 – November 26, 1987) was an American psychologist best known for his psychometric study of human intelligence, including the distinction between convergent and divergent production.

Developing the views of L. L. Thurstone, Guilford rejected Charles Spearman's view that intelligence could be characterized in a single numerical parameter. He proposed that three dimensions were necessary for accurate description: operations, content, and products. A ''Review of General Psychology'' survey, published in 2002, ranked Guilford as the 27th most cited psychologist of the 20th century. Provided by Wikipedia