J. P. Guilford
Joy Paul Guilford (March 7, 1897, Marquette, Nebraska – November 26, 1987, Los Angeles) was a United States psychologist, best remembered 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 and proposed that three dimensions were necessary for accurate description: operations, content and products.
Read more about J. P. Guilford: Guilford's Career, Guilford's Structure of Intellect, Criticism, Selected Bibliography